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Altra Lone Peak 4 Mid RSM Review

One of the more popular models seen on the big thru hikes of North America, this boot offers a unique fit and is ultra lightweight
altra lone peak 4 mid rsm hiking boots men review
Credit: Backcountry
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Price:  $160 List
Manufacturer:   Altra
By Ryan Huetter ⋅ Review Editor  ⋅  Apr 21, 2020

Our Verdict

The Altra Lone Peak 4 Mid RSM is a lightweight hiking boot that has become a very popular model among long-distance backpackers. Built for foot comfort, this unique shoe has a lot of room for those with wide feet. The boot is really a trail running shoe that has higher ankle coverage and more waterproof ability in wet weather and comes with handy features that allow it to pair well with gaiters. We like this boot for specialized applications as a long-distance lightweight hiker, but it was not as well-rounded as other models that are also capable as a fastpacking boot.
Great for wide feet
Comfortable and light
Zero drop takes getting used to
Traction lacking

Our Analysis and Test Results

We tested this boot in the foothills of the Sierra Nevada Mountains, hiking over rock and scree, through talus and snow, and even used them for trail runs.

Performance Comparison

altra lone peak 4 mid rsm hiking boots men review - putting the altra lone peak to the test in the rocky hills east of...
Putting the Altra Lone Peak to the test in the rocky hills east of the Sierra Nevada.
Credit: Ryan Huetter


Altra has certainly been making a name for themselves as one of the most popular models for long-distance thru-hiking, so certainly they must be doing something right in the comfort department. Our lead tester was not familiar with the fit and feel of Altra shoes prior to testing the Lone Peak 4 Mid RSM. We were immediately impressed at how soft and roomy they feel, right out of the box. The soft material requires no break-in period, so they are ready to hit the trail.

altra lone peak 4 mid rsm hiking boots men review - the lone peak boots are quite nice on flat trails, but the...
The Lone Peak boots are quite nice on flat trails, but the relatively thin 25mm soles allow us to feel a lot of the rocks when in more rough terrain.
Credit: Ryan Huetter

The fit is unique and may take a bit of time to get used to. Altra shoes and boots are known for their "zero drop" soles, meaning there is no change in height from the heel to the toe. This makes the foot sit flat (which some podiatrists recommend as being more foot healthy). We are getting used to this, but we did really enjoy the width of the Footshape toe box, which allows our feet to spread out and relax, resulting in fewer hotspot issues than we would have expected.

altra lone peak 4 mid rsm hiking boots men review - the laces on the lone peak 4 go all the way up (no lacing hooks), so...
The laces on the Lone Peak 4 go all the way up (no lacing hooks), so you have to pull the boots on a bit using the pull tab.
Credit: Ryan Huetter


The Lone Peak 4 boots are essentially a beefed-up trail running shoe, so let's start there when assessing their stability. Obviously they will not stack up well against a rugged mountain boot made from full-grain leather, but on their own, are they stable? They have a 6-inch ankle cuff height, which drops to 4.5-inches in the back, and this allows them to flex well when making long strides. The laces can be cinched down for a secure fit, which acts as much as a reminder not to roll your ankle as anything else. This boot has virtually no torsional stability built into the midsole.

altra lone peak 4 mid rsm hiking boots men review - the lone peak is a soft boot, for sure. we slopped around quite a...
The Lone Peak is a soft boot, for sure. We slopped around quite a bit when testing these boots on the boulder fields.
Credit: Ryan Huetter

The real question around stability, for us, revolved around the space in the footbed. This wide fit gives a lot of room to wiggle around, which can be nice when on simple terrain, but when side-hilling and hopping through challenging off-trail conditions, we chose to move more cautiously due to the limited stability offered by our footwear.


Altra uses a proprietary rubber compound and tread design called Duratread on their Lone Peak 4 Mid RSM boots. We find it to be good on trails and other firm surfaces and had good experiences on wet and dry trail types. The boots are wide so there is a lot of surface area contact, but the wide fit also keeps them from edging effectively and we did not feel confident while boulder hopping in off-trail talus or when carrying heavy loads.

altra lone peak 4 mid rsm hiking boots men review - whoa! almost went for a dive into the mud there! the lone peak 4s...
Whoa! Almost went for a dive into the mud there! The Lone Peak 4s had pretty mediocre traction in soft conditions like mud and snow.
Credit: Ryan Huetter

We also are not super impressed with their performance in slippery conditions. The tread is very shallow, so they do not gain good traction in scree or mud.


The Altra Lone Peak 4 Mid boots weigh 1.77 pounds per pair. That is crazy light for a hiking boot, no matter what. Some of our favorite hiking shoes, which are low-cut, often struggle to make that weight. Yet, these are not the lightest boots in this review.

Wearing these for hours at a time on the foot was almost unnoticeable, so even though they did not win in this metric, they were so close that we gave them a very high mark in regards to their overall weight.

Water Resistance

The Altra Lone Peak 4 Mid RSM is built to withstand rain, snow, and mud. We find that it offers good waterproofness in wet weather, and keeps snow and mud out (but that we are not as stoked for the snow and mud due to some traction limitations). The way Altra gets their waterproofing is pretty cool - instead of using the traditional waterproof/breathable membrane that is sewn into the inside of the boot, they use a fully waterproof upper fabric material made of eVent. This techy solution saves some weight and lets them breathe a bit better than other models we tested in warm weather.

altra lone peak 4 mid rsm hiking boots men review - the rsm model is equipped with an event fabric that works well to...
The RSM model is equipped with an eVent fabric that works well to keep the water out.
Credit: Ryan Huetter

Some users have issues with the waterproofing, though in our field testing we stood in a cold mountain stream for 5 minutes and as long as the 4-inch flood height wasn't breached, our socks stayed dry.


We did not have any major issues while testing the Lone Peak 4 boots, but we anticipate that it won't be long before we do. The upper material is just so light and many of the seams are glued or welded and not sewn, leaving many opportunities for delaminations, which lots of users report as a problem. This is one of the issues with going lightweight in materials, they will not usually be durable for more than a season or so of hard use.

altra lone peak 4 mid rsm hiking boots men review - the tread on the lone peaks is pretty soft, we anticipate them...
The tread on the Lone Peaks is pretty soft, we anticipate them wearing out after a summer of use.
Credit: Ryan Huetter


For the weight and comfort, as well as the high-tech waterproof fabrics, these boots are a good value.


We appreciate the Altra Lone Peak 4 Mid RSM as a specialized hiking shoe that will feel at home on a long-distance hike such as the JMT, PCT, or Appalachian Trail. They do well on the trail and are really lightweight, making them great for this application, as well as for those just looking for a comfortable, wide boot that is also appropriate for light hiking trips.

Ryan Huetter
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