How to Choose Running Socks

The eight pairs of socks tested for this year's review  side by side. From left to right: Thorlo Experia XCCU  Darn Tough Coolmax Vertex Tab No Show Ultra-light Cushion  Balega Hidden Comfort  DryMax Running Mini Crew  Smartwool PhD Run Light Elite Micro  Darn Tough No Show Light  Feetures! Elite Light Cushion No Show Tab  and the Injinji Trail 2.0 Midweight Mini-Crew.
Article By:
Andy Wellman
Senior Review Editor
OutdoorGearLab

Last Updated:
Friday
April 20, 2018
How do you best choose which pair of running socks to buy? After putting nine of the top rated and most popular running socks available on the market today to the test, we have a pretty good idea of what choices need to be made when selecting a running sock. Check out our Best Running Socks for Men Review to find out which socks we liked best overall and for specific purposes. Below we break down different choices one will need to make to choose a running sock, and give you an outline that may help your decision making process.

Why Buy Running Socks?


Running is a simple activity: the only thing that you need is a good pair of shoes. But is that true? What about the socks that protect your foot from your shoe? The truth is that a good pair of socks is just as important as shoes when it comes to enjoying your run and wanting more. Not convinced? We suggest you talk to someone who has had their goal race derailed by blisters or foot issues, and ask them whether sock choice is something to be taken lightly.

Testing running socks on a long canyon country run in the Canyon Lands  Utah. Despite its look  this most certainly was the trail.
Testing running socks on a long canyon country run in the Canyon Lands, Utah. Despite its look, this most certainly was the trail.

We chose socks that were made out of different fiber combinations, with varying levels of padding, and different ankle heights. Socks play an incredibly important role in keeping your running feet happy, in ways that may not be immediately obvious. The two biggest enemies of a runner's foot are friction and moisture. Socks play a critical role in mitigating these potentially catastrophic obstructions.

Friction occurs when a runner's foot moves around inside a shoe, rubbing forward and backward as the runner's foot moves through each stride. Too much friction localized in a particular area causes heat build-up, as well as trauma to individual cells. These traumatized cells fill with fluid, swelling and eventually creating painful blisters. While a running shoe is designed to protect feet from the ground, a sock protects the foot from the shoe. A useful sock will help a foot and shoe grip each other effectively, reducing friction. They can also work to absorb and dissipate some of the energy transferred to the foot, helping to reduce heat buildup and swelling.

Moisture is another enemy of the foot, and again socks prove to be the best weapon to combat this problem. Running on dry roads and trails in warm or hot weather will cause a runner's foot to sweat inside their shoe, and a decent sock can help to absorb and move the sweat away, where ideally a highly breathable shoe will help it evaporate. Running in the rain, mud, or snow only makes this problem worse, demanding that much more performance from your sock. When moisture isn't quickly removed from the foot, the skin is quick to absorb it, leading to softening and swelling. Take our word for it—soft and swollen skin is much quicker to break down and blister than tough, dry skin, and so for long runs, making sure that liquid travels away from the foot is essential.

The Perimeter Trail around Ouray is our best local trail  offering unique sections of trail with amazing views; a great place to test running socks and trail running shoes.
The Perimeter Trail around Ouray is our best local trail, offering unique sections of trail with amazing views; a great place to test running socks and trail running shoes.

A slightly less important role of a running sock relates to hygiene. If you have ever lived with someone who insists on running without socks (or if this is you), then you are well aware how quickly bacteria and fungi breed in the warm, dank environment of running shoes. Not only do these microbes create a horrible stench, but they can also lead to an increased chance of infection. Running-specific socks help manage the moisture that causes bacterial and fungal colonies to thrive, minimizing this in the shoes themselves. They can be easily washed and sterilized after every run.

Some of our test "runs" involved more scrambling and hiking than actual running. Here on top of Dallas Peak near Telluride  CO.
Some of our test "runs" involved more scrambling and hiking than actual running. Here on top of Dallas Peak near Telluride, CO.

It is worth noting that running socks are typically made by companies that make socks for all types of activities, not simply running. So, if you go to a company's website, you are likely going to encounter lots of other socks that are not running socks. For running, we prefer a sock that is thin, or at most medium thickness, and has a moderate amount of cushioning mapped into the most appropriate places. We prefer either no-show or mini crew as our ankle height. Taller or thicker socks have their purposes, just not for running. If you are interested in models for hiking, check out our Best Hiking Socks for Men Review.

Types of Running Socks — Endless Choices


A quick perusal of the running sock market and one will quickly realize that there are many, many brands of running socks available to choose from. Not only that, but each manufacturer seems to use its own blend of natural and synthetic fibers, produces socks in a whole variety of thicknesses, each paired with a different level of cushioning, and coming in a whole variety of different ankle heights. If you take all these different factors and choices together and multiply them to figure out how many potential combinations there are to come up with a running sock, we think that number would be in the millions (we didn't do that math ourselves, as we majored in writing, not mathematics). Below we break down the differences in fabrics, thicknesses, padding, ankle cuts, and special features, so you have a better idea of what you are choosing when you select a running sock.

Thickness


Peruse the website of a running sock manufacturer, and you are likely to notice that socks come in a surprising amount of different thicknesses. These different levels are often described with variations of the words: ultra-light, light, light cushioning, medium weight, full cushioning, ultra-cushioned, etc. In general, when describing their socks, most manufacturers will be sure to tell you what the thickness of the fabric used throughout the sock is (e.g. light, ultra-light), as well as how much cushioning is to be found underneath the foot.

For this test, we chose only those pairs of socks with thicknesses that we felt were the most appropriate for running. In general, sock companies are into making socks for all purposes, and running is just one of those purposes. While there may be some circumstances or types of feet that warrant exceptions to our choices, we felt that the most appropriate thicknesses for running socks are ultra-light, light, and medium. With that in mind, the selection of socks in this review is taken from these three thicknesses.

Ultra-light
These socks tend to be very thin and have no extra padding or cushioning. They are a great choice for running in the middle of summer or in sweltering temperatures where you need your foot to breathe and don't want your sock to trap in any extra heat. There are a few downsides to these socks, such as a total lack of padding, and the fact that they are so thin that your favorite shoes may fit differently than when wearing a cushioned sock. The only ultra-light sock in this review that we tested was the Darn Tough No Show Light, which we felt was confusingly misnamed.

The white mesh of the Thorlo Experia XCCU is so thin and breathable that you can basically see through it. This was the thinnest sock in this review  but we didn't notice any durability issues during our test period.
The white mesh of the Thorlo Experia XCCU is so thin and breathable that you can basically see through it. This was the thinnest sock in this review, but we didn't notice any durability issues during our test period.

Light
This thickness makes up the majority of the socks that we tested and was also the thickness that we felt was the perfect combination for most running. These socks tend to use a combination of very thin and breathable fabrics on the top of the foot and throughout the arch, paired with padding and cushioning in the heel and forefoot/toes of the foot. In our opinion, this combination of fabrics provides the best of both worlds, managing heat and moisture with wicking and breathing fabrics, while also protecting the high impact areas of the feet with extra padding. Most of the socks in this review fall into this category.

The Darn Tough No Show Light was the only sock in this review that had absolutely no padding or cushioning at all  as seen in this photo. It is made of a tightly woven and thin merino wool and nylon blend.
The Darn Tough No Show Light was the only sock in this review that had absolutely no padding or cushioning at all, as seen in this photo. It is made of a tightly woven and thin merino wool and nylon blend.

Medium or Midweight
A couple of the socks we reviewed are medium thickness, the DryMax Running Mini Crew and the Injinji Trail Midweight Mini-Crew. These types of socks have thicker fabric throughout the entire sock. Many companies claim that due to the physics involved in moisture transfer, these socks will keep your feet as cool as a light sock. However, to work in this manner, moisture transfer has to be continually happening from inside to outside of the sock. There is no doubt that these socks are warmer and we prefer them for colder seasons or conditions. Some prefer them due to the extra protection and padding one gets from their added thickness.

Showing the inside of the Injinji sock under the sole  you can see how the large looped cushioning fabric covers the entire underside of the foot up to the forefoot  but the toes area is made out of a tightly woven  smaller fiber to reduce extra bulk. This sock has a medium thickness.
Showing the inside of the Injinji sock under the sole, you can see how the large looped cushioning fabric covers the entire underside of the foot up to the forefoot, but the toes area is made out of a tightly woven, smaller fiber to reduce extra bulk. This sock has a medium thickness.

Thick
We think that this thickness of socks is not really appropriate for running. These socks are ideally suited for hiking, skiing, and other cold weather activities.

Fabrics


All of the running socks in our review are made of a blend of fibers, typically some form of proprietary polyester, nylon, elastic, and sometimes wool. Each of these fiber types has its own set of positive and negative attributes, and the way in which they are blended gives the sock most of its performance enhancing (or not) qualities. The particular blend of fabrics found in any given sock can be found on their website and is also printed with percentages on the UPC label of every pair of socks.

The inside of the Smartwool sock shoes the black merino wool pads and the white nylon and elastic stretchy bands that loop over the top of the foot and the arch.
The inside of the Smartwool sock shoes the black merino wool pads and the white nylon and elastic stretchy bands that loop over the top of the foot and the arch.

Polyester
The first "ingredient" listed on many pairs of running socks is some form of polyester. Many of these polyesters are proprietary blends that are designed to be better at moisture control and wicking. Some of the names you may see in this review are Coolmax, Thor-wick Cool, and Drynamix. Polyester is a synthetic fiber that is primarily made from oil that is solidified and woven into fibers. Compared to nylon it is more hydrophobic, meaning it does not absorb water as well, a very beneficial attribute for running socks. However, it is not as durable or reliable as nylon, which is why it is often blended to make socks.

Running on the bike paths above the Uncompahgre River with Mt. Sneffels in the background  in a polyester blend running sock  the Thorlo Experia XCCU.
Running on the bike paths above the Uncompahgre River with Mt. Sneffels in the background, in a polyester blend running sock, the Thorlo Experia XCCU.

Nylon
Nylon is another synthetic fabric that is known for its incredible durability and strength. It is found in every single pair of running socks that we reviewed here, and is usually the second most prevalent fabric. It is blended with polyesters in running socks to add strength and durability, as well as stretchiness. However, nylon is known for absorbing water much easier than polyester, which is why none of these socks are made from nylon. A perfect blend of these two materials will give a pair of running socks strength, durability, stretchiness, and moisture-wicking abilities.

The inside of the Feetures! socks  showing how the cushioning runs the entire length of the foot  and also how the nylon padding in this sock is clearly much thinner and less bulky than most of the other padded socks we tested.
The inside of the Feetures! socks, showing how the cushioning runs the entire length of the foot, and also how the nylon padding in this sock is clearly much thinner and less bulky than most of the other padded socks we tested.

Elastic/Spandex
Elastic and Lycra Spandex are proprietary names for stretchy rubber fibers. They are blended into running socks in tiny percentages, typically in the 1-6% range. They add both stretchiness and support, and are responsible for the constricting and hugging action that takes place most frequently underneath the arch of the foot. The downside of these fibers is that they dry out and break easily, which is why elastic areas of clothing such as compression socks or the waist bands of running shorts tend to end up entirely stretched out well before the rest of the garment has broken down.

Merino Wool
Merino wool comes from the Merino sheep and is much softer and more comfortable against the skin than the version of wool that usually comes to mind when remembering an old itchy sweater. Merino wool is used in place of polyester in a few of the socks that we tested, the Smartwool PhD Run Light Elite Micro and the Darn Tough No Show Light. The advantages to wool are that it effectively wicks moisture in a liquid state, and also breathes very well if moisture is in a vapor state. Its ability to breathe means it is versatile in both hot or cold climates. Some people also like it because it is a natural fiber, rather than purely synthetic (although in the case of running socks it is still blended with synthetic fibers). The downsides of merino wool are that it is more expensive than polyester, and it is not quite as durable.

The inside of the Smartwool sock shoes the black merino wool pads and the white nylon and elastic stretchy bands that loop over the top of the foot and the arch.
The inside of the Smartwool sock shoes the black merino wool pads and the white nylon and elastic stretchy bands that loop over the top of the foot and the arch.

Olefin
Olefin fibers are the primary constituent of the DryMax Running Mini Crew socks but are not found in any of the other socks in this review. They are also synthetic polymer fibers, known for their excellent bulk to weight ratio, meaning they are a good insulator for low weight. They are also known for their water resistance and wicking capabilities, two attributes put to perfect use in the DryMax socks.

The inside of the DryMax sock  showing the looped olefin fibers that run the entire length of the sole. These fibers were by far the most effective at wicking away moisture.
The inside of the DryMax sock, showing the looped olefin fibers that run the entire length of the sole. These fibers were by far the most effective at wicking away moisture.

Padding and Cushioning


Padding and cushioning serve a few important purposes in running socks. They provide a barrier between your foot and the shoe, lessening the effects of repeated stress on the sensitive tissues of the foot. While the small pads and cushions do little to reduce the impact of running itself, they usually do an adequate job of mitigating rubbing and chaffing within the shoe that can eventually lead to blisters. The looped fibers that make up the padding in running socks are most often polyester or wool fibers that are designed to wick moisture from next to the foot to outside the sock. Lastly, padding can help a shoe fit better by filling extra volume within the shoe.

Most of the running socks that are available on the market today, and in this test, have some amount of padding or cushioning. In our opinion, the best designs are those that pair a very light thickness sock with targeted or mapped cushioning in the areas of highest wear and abrasion — under the forefoot, the toes, on the sides of big and pinky toes, and all around the heel, including the Achilles tendon. Some socks are not as detail oriented in their padding locations, and simply pad the entire underside of the foot, or in some cases fail to pad all of the necessary areas. When trying on and purchasing running shoes, it is essential to wear the types of socks that you intend to run in for the best fit. If you want to wear a padded sock while running, then be sure to wear one at the shoe store.

Sock Height


Most socks come in a variety of ankle cuts, and here we highlight the pros and cons of the most common heights for running.

No Show, or No Show Tab
Showing the no-show height of these socks  resting just below the ankle bone. Notice also the tab in the back that helps protect the back of the ankle as well as keep the sock from slipping down inside the shoe.
Showing the no-show height of these socks, resting just below the ankle bone. Notice also the tab in the back that helps protect the back of the ankle as well as keep the sock from slipping down inside the shoe.

No show socks are designed to be very short and to be invisible when worn. The top of the sock is cut to rest far below the ankle, hidden within the shoe, hence the name "No Show". A No Show Tab is the same thing, but with a little extra tab on the back of the sock that often rests above the heel of the shoe. This little tab is designed to prevent the back of the sock from slipping down within the shoe, over the heel, or in any manner that causes it not to fit as designed. Besides being the most fashionable, no-show socks are the sock of choice for most road runners. With the least amount of fabric covering skin, they are the coolest choice and also have the benefit of not creating tan lines on the lower leg. They are not typically an optimal choice for trail running because they tend to allow dirt and rocks to filter into the sock easier.

The Balega Hidden Comfort is another no-show height sock with a large round cushioned tab on the back. In the case of this sock  it was very necessary to keep it from slipping down into the shoe and over the heel  so we were happy it was there.
The Balega Hidden Comfort is another no-show height sock with a large round cushioned tab on the back. In the case of this sock, it was very necessary to keep it from slipping down into the shoe and over the heel, so we were happy it was there.

Mini Crew
"Trail" running in the winter in Colorado means you will be running on snow  which is far preferable to running in mud  the other alternative. Here testing the thick DryMax Running Mini Crew socks on a warmish evening near Ridgway.
"Trail" running in the winter in Colorado means you will be running on snow, which is far preferable to running in mud, the other alternative. Here testing the thick DryMax Running Mini Crew socks on a warmish evening near Ridgway.

Mini Crew socks have an ankle cut that comes up just above the ankle bone, and no higher. They are often the most practical choice for trail running because they do a decent job of keeping out dirt and pebbles. They also provide much-needed protection for the skin of the ankles, which can get scuffed or cut up by trail obstacles or the other shoe on rough terrain. They have the downside of being warmer than no show socks, and that they leave a nice tan line across the lower leg. Three of the pairs of socks we tested fit this category, the Injinji Trail, Stance Appalachian QTR, and the DryMax Running Mini Crew, although virtually all of the choices we tested can be purchased in a different ankle height if desired.

The DryMax Running Mini Crew comes up a bit higher than a no-show sock  fully covering the bony protrusion of the ankle bone  a nice feature for trail runners.
The DryMax Running Mini Crew comes up a bit higher than a no-show sock, fully covering the bony protrusion of the ankle bone, a nice feature for trail runners.

Knee High
Knee high socks are becoming more popular for running, generally in the form of compression socks. We did not test any knee high or compression socks for this review. The benefit of knee high compression socks is that they hug and support the calves and shins while running, supposedly increasing blood flow and reducing muscle fatigue and damage, especially over long distances.

There are many different sock heights in between the three we have described here that we have ignored since they are not common or practical for running purposes.

Special Features


There are a couple of interesting and unique features found on a few of the socks that we tested that are worth pointing out.

Anatomical Fit
The Feetures! Elite Light Cushion No Show Tab running socks have an anatomical fit, as do the Stance Appalachian QTR, meaning that the socks are designed for either a right or a left foot. To tell the difference and make sure you are putting the correct sock on the correct foot, there is a little "R" or "L" printed on the big toe area of the Feetures! sock or you have to pay attention to the anatomical patterning around the arch of the Stance sock. This feature is designed to improve the fit, and we must say that these are some very form fitting socks that do an excellent job of hugging and supporting the foot, without extra fabric or creases. Feet are not symmetrical, so this is a feature that makes sense, especially if you have trouble finding the perfect fitting sock.

The Feetures! socks were the only ones in this review that came in anatomically fitting left and right socks  easily identified by the letters on the big toes shown here.
The Feetures! socks were the only ones in this review that came in anatomically fitting left and right socks, easily identified by the letters on the big toes shown here.

Toe Socks
The Injinji Trail Midweight Micro Crew feature individually "cut out" toes, as do all Injinji socks. These are called toe socks. The advantage to each toe having its own little sock that it fits into is that it cuts down on rubbing and moisture build up between toes. This can be a very worthy attribute if you commonly get blisters between the toes, or if your toes are close to each other and rub a lot. They are somewhat like flip-flop sandals, meaning that having all that material between your toes can be annoying at first and take a little bit of getting used to. They are also a real pain to put on. We have found that in really long races they did indeed reduce the preponderance of toe blisters (a problem we have had in ultra marathons in the past), but the thicker versions seemed to work better (for us) than the very thin versions.

Toe socks! Like all Injinji socks  these toe socks wrap around each individual toe  helping to separate them and allow them to splay in their natural position  without rubbing against each other.
Toe socks! Like all Injinji socks, these toe socks wrap around each individual toe, helping to separate them and allow them to splay in their natural position, without rubbing against each other.

Choosing the Best Running Sock


Now that we have fully discussed the various options that are available in running socks, we hope to give you some direction regarding the process for choosing the perfect sock for you.

Trail vs. Road


Typically we would begin a search for the perfect piece of equipment by deciding what our intended use for it is, and then narrowing down the selection from there. With running socks, this process is a bit more difficult because deciding when you are going to be using your pair of running socks doesn't narrow down the field as much as we would hope. Nevertheless, it can be helpful to point out which attributes work better for road vs. trail running.

Road
There is really no kind of running sock that doesn't work for road running. Most road runners seem to prefer no-show socks because they are cooler and don't leave tan lines. That said, any kind of sock, whether thick or thin, padded or not, could be appropriate for you.

The Experia XCCU make a great road running sock  as we discovered while testing them during winter in Colorado.
The Experia XCCU make a great road running sock, as we discovered while testing them during winter in Colorado.

Trail
If you primarily run on trails, then there are a few kinds of socks that seem to work better than others. While no show socks will of course work, we find that they can annoyingly let in more dirt and debris than mini-crew height socks. The same thing goes with tabs. Tabs on socks have a way of collecting dirt and funneling them down into the sock. It is annoying enough to have to take a shoe off to empty dirt or pebbles, but it is even more annoying to have to take off the socks as well. Despite the annoying tan lines that come with them, we think Mini-Crew socks are the way to go for trail and mountain running.

Courthouse Mountain and Chimney Rock in the background on a "testing" run up the West Fork of the Cimarron River in the San Juan Mountains of Colorado. While no-show socks will work for this sort of terrain  they are not ideal  as they tend to more easily collect mud  dirt  and debris.
Courthouse Mountain and Chimney Rock in the background on a "testing" run up the West Fork of the Cimarron River in the San Juan Mountains of Colorado. While no-show socks will work for this sort of terrain, they are not ideal, as they tend to more easily collect mud, dirt, and debris.

The choice to go with padding or no padding when trail running is a personal preference, but it is our opinion that some amount of cushioning is helpful. Trail running involves running on an uneven surface, meaning that the foot may need to apply force in any direction. Some amount of padding protects the foot from rubbing and abrasion within the shoe, and also helps prevent it from slipping.

Fit of the Shoe


If you are buying socks for a pair of shoes that you already own, then you will need to figure out what thickness sock they are sized for. Different thickness socks take up different amounts of volume within a shoe, and the same shoe is not going to fit the same with a medium thick sock compared to an ultra-light one. On the other hand, if you have a shoe that is a little too loose, you might try wearing a thicker sock, and vice versa.

The Sizing Chart


It also helps to look at individual sock maker's sizing charts before purchasing. Unfortunately, they are all different. Some manufacturers have very small size ranges, while others have vast ranges. For one brand of socks your foot size might fall right in the middle, thereby giving you a perfect fit, while for others you may be right on the edge, meaning that no matter what size sock you choose, it will be either too big or too small. If we fell right on the edge of a size range and didn't have the opportunity to try the sock on, we would probably decide to look at a different brand of socks, rather than stick to one brand and make do with a slightly mis-sized sock.

Showing the variations in size of socks one can end up with  all when ordering socks for the same size foot! Left to right: Balega Hidden Comfort  Darn Tough Coolmax Vertex Tab No Show Ultra-light Cushion  and Injinji Trail 2.0 Midweight Mini-Crew.
Showing the variations in size of socks one can end up with, all when ordering socks for the same size foot! Left to right: Balega Hidden Comfort, Darn Tough Coolmax Vertex Tab No Show Ultra-light Cushion, and Injinji Trail 2.0 Midweight Mini-Crew.

Narrowing the Search


After narrowing the field down slightly by accounting for the things listed above, you are probably still left with a vast selection of potential running socks. There is an expression in running that says, "never try something new on race day." The reason that this is such good advice is that you are never going to know if something works unless you try it. Luckily, socks are pretty cheap. What has worked the best for us in the past is to select four or five different types of socks from different brands, and then try them all out on a run. You may have to play the role of gear reviewer for yourself, and luckily socks are affordable enough that this won't come at a massive expense to your wallet. We can't all afford piles of hardshell jackets to test which one we like best (that's what OutdoorGearLab is for!), but we can all afford a handful of different socks to determine which ones we like best. After running in your selection of four or five pairs, you will know which ones groove with you and can order a bunch of those next time you need to stock up. If you end up with lots of pairs you don't like, you can surely give them away, or trade them, to someone who will love them.

Tips and Advice


Through our lengthy research and review process involving running socks, we have come up with a few tips and pieces of advice we would love to share.

Sock Care


Manufacturers have differing ideas about how to wash their socks. Some, especially ones made with wool, will need to be air dried to keep from shrinking. Other manufacturers suggest that you wash and dry them inside out to re-fluff up the padded portions. Pay attention and make a mental note about how to take care of your investment before you throw away the packaging. No matter what, it's important to wash socks after each use. Dirt and sweat can be your greatest enemy when trying to prevent wear and blisters. The sweat and dirt will work to break down the fabric and keep the padding from staying soft. Dirty socks will not be able to breathe as well as clean ones, causing more moisture build-up and the dirt can also cause added friction. If you are running long distances, it can be a good idea to bring an extra pair. It is very refreshing to put on a clean pair mid-race or run, and it can give you a boost or second wind.

Fakes on Amazon


Look on amazon.com for running socks and you will find that some pairs have an incredible amount of user reviews. Click to filter only the one-star reviews, and you will see that in most cases the one-star reviews come from people who were shipped rip-offs: fake imitation socks masquerading as the running socks you want to buy. If you order socks on Amazon and find that what shows up doesn't look like what you ordered, it probably isn't! Be sure to send them back and alert Amazon to the problem.

Crystal Lake is one of our favorite places to get in a short  relatively flat run (hard to find in these mountains) in an incredible setting. Here we are testing different socks against each other with a brown dog.
Crystal Lake is one of our favorite places to get in a short, relatively flat run (hard to find in these mountains) in an incredible setting. Here we are testing different socks against each other with a brown dog.



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