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Meriwool Merino 250 Long Sleeve Review

This top delivers the fine qualities of a Merino wool base layer without the extreme cost
meriwool merino 250 long sleeve base layer review
Credit: Meriwool
Best Buy Award
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Price:  $60 List | $59.99 at Amazon
Pros:  Affordable, very warm, fashionable fit, breathable
Cons:  Finer thread Merino is not quite as durable, slightly itchy, shoulder top seams
Manufacturer:   Meriwool
By Aaron Rice and Justin Simoni  ⋅  Nov 12, 2022
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73
OVERALL
SCORE


RANKED
#9 of 18
  • Warmth - 25% 9.0
  • Breathability - 20% 7.0
  • Comfort and Fit - 20% 7.0
  • Durability - 15% 5.0
  • Drying Speed - 10% 9.0
  • Layering Ability - 10% 6.0

Our Verdict

In many ways, tops like the Meriwool Merino 250 Long Sleeve are helping redefine stereotypes about fine, 100% Merino wool base layers. Mainly, this thermal offers the same top quality at a fraction of the cost. The extra-fine spun wool favors breathability slightly over pure warmth, so it is enticing to those looking to push it uphill on the skin track this winter. From flatlock seams to a hang-tab, thoughtful features round out the slim fit of this fashionable layer — it is just as comfortable in the alpine as it is out to dinner.

Editor's Note: This review was updated after a full retest on November 12, 2022.

Compare to Similar Products

 
Awards Best Buy Award Best Buy Award    
Price $60 List
$59.99 at Amazon
$65 List$55 List$35.95 at Amazon$40 List
$39.95 at REI
Overall Score Sort Icon
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Pros Affordable, very warm, fashionable fit, breathableSoft and stretchy fabric gives freedom of movement, great value, thumb loopsUltralight, airy and breathable, affordable, 100% recycled polyesterExtremely breathable, lightweight, dries fast, super affordableInexpensive, breathable, functional
Cons Finer thread Merino is not quite as durable, slightly itchy, shoulder top seamsNot as warm as wool layers of the same weight, risk of smelling if left unwashed after useNot a warm layer by itself, loose-fitting cuffs can get caught up when layeringPoor fit, not very warm, not super durable, stinkyLack of durability, longer dry times
Bottom Line This top delivers the fine qualities of a Merino wool base layer without the extreme costOne of our favorite super stretchy, soft, and warm synthetic base layers for cool to cold conditionsA high-value piece whose breathability and airy fit means that it can be worn for high-output activity regardless of the season, but not your go-to layer for mid-winter warmthThis top is an impressively breathable and lightweight base layer built for activities where you are creating a lot of heatA simple, functional base layer with performance issues consistent with the price point
Rating Categories Meriwool Merino 250... Cotopaxi Liso Top Patagonia Capilene... Helly Hansen Lifa S... REI Co-op Lightweig...
Warmth (25%)
9.0
6.0
4.0
5.0
5.0
Breathability (20%)
7.0
7.0
9.0
8.0
8.0
Comfort and Fit (20%)
7.0
9.0
8.0
7.0
7.0
Durability (15%)
5.0
8.0
7.0
9.0
6.0
Drying Speed (10%)
9.0
9.0
10.0
8.0
8.0
Layering Ability (10%)
6.0
8.0
7.0
6.0
6.0
Specs Meriwool Merino 250... Cotopaxi Liso Top Patagonia Capilene... Helly Hansen Lifa S... REI Co-op Lightweig...
Material 100% Merino wool 84% recycled polyester, 16% spandex 2.3 oz 100% recycled polyester double knit 100% Lifa Dry 92% polyester, 8% spandex
Fabric Weight 250g/m² 200 g/m² 94 g/m² 125 g/m² 200 g/m²
Weight (size large) 10.1 oz 8.5 oz 3.8 oz (size medium) 5.2 oz 7.1 oz
Available Cuts Crew Crew Crew, short sleeve Crew Crew, short-sleeve, 1/2 zip
Thumb Loops? No Yes No No No
Air Dry Test 40 min 40 min 30 min 45 min 45 min
Fit Slim fit Semi-fitted Slim fit Slim fit Semi-fitted
Stitching Flatlock and flat seams Flatlock seams Flatlock seams Flatlock seams Flatlock seams
Dryer Safe? No Yes Yes Yes Yes
Shoulder Top Seams? Yes No Yes Yes No
Drop Tail Hem? No No Yes No Yes

Our Analysis and Test Results

As a relative newcomer to the Merino scene, Meriwool produces high-quality base layers at an affordable price point that stands in direct contrast to much of the marketplace. The Meriwool Merino 250 is a competitive 100% Merino base layer with a midweight-standard fabric weight of 250 g/m².

Performance Comparison


meriwool merino 250 long sleeve base layer review - even on a chilly alpine morning, this base layer kept us warm and...
Even on a chilly alpine morning, this base layer kept us warm and comfortable from our sleeping bag to the trail.
Credit: Jill Rice

Warmth


As soon as we lifted it from the box, we knew that this was a base layer able to stand up to even the best of the competition. Although the 250 g/m² fabric weight puts the Merino 250 at the top-end of our midweight selection, actually wearing this top suggests otherwise. It is curiously more lightweight than other, similar tops, making it more adept at thermoregulation than most. Even on warm fall trail runs with lots of vertical gain, we never felt overheated while wearing this as a single layer. And as the seasons transitioned, we had no issues waking up and walking through frosty fields while backpacking in the alpine.


Despite the relatively similar fabric weight to other tops we tested, it does seem that the extra-fine Merino chosen to knit this layer makes a difference when it comes to warmth. It is not as warm as its direct competitors — we were noticeably colder, particularly when wearing this layer as a standalone top. For shoulder-season activity and into the winter, this is a great option. But don't be surprised if it comes up a bit short on the coldest days in the deep of winter.

meriwool merino 250 long sleeve base layer review - coffee warms from the inside, this layer effectively helps keep us...
Coffee warms from the inside, this layer effectively helps keep us warm from the outside.
Credit: Jill Rice

Breathability


Where this top falls a bit short in terms of overall warmth, it picks back up when it comes to thermoregulation thanks to impressive breathability. Merino wool is known for its incredible moisture-wicking ability and the efficiency with which the fabric passes sweat from the inside to the outside for evaporation. The extra-fine Merino yarns chosen for the weave of the Meriwool Merino 250 only improve that efficiency. For intense training sessions in cool-to-cold weather, this base layer pairs effectively with a lightweight shell, like a windbreaker.


For a layer with a density of 250 g/m², we must admit this layer performs much more similarly to those midweight base layers on the lighter end of the spectrum at around 200 g/m². As breathability tends to trend oppositely to warmth, it is no surprise that the small tradeoff the Meriwool makes in terms of warmth, it gains back in breathability. If you plan to be working hard — whether it's skinning uphill or chopping wood — this top is an excellent alternative to thicker baselayers we tested at the same or similar fabric weight.

meriwool merino 250 long sleeve base layer review - even on sun-blasted uphills during long, fall trail runs, we were...
Even on sun-blasted uphills during long, fall trail runs, we were seriously impressed with the performance of this layer.
Credit: Jill Rice

Comfort and Fit


Plush, but not too thick; soft, but not too delicate; the Meriwool Merino 250 seems to find that Goldilocks zone of comfort. Although we admit that the finer wool threads were a bit itchy at first, they quickly began to soften through regular wearing and washing.

Spun from 100% extra fine Merino wool, this layer is a little...
Spun from 100% extra fine Merino wool, this layer is a little particular in how it balances warmth and breathability.
This layer is designed with three distinct types of seams: flatlock...
This layer is designed with three distinct types of seams: flatlock for most of the body, flatlock backed flat-seams in the cuffs, and standard flat seams around the hem.

Flatlock seams across the majority of this top (with the exception of the hem) ensure that the seams won't rub when worn next to the skin. In the future, we hope that Meriwool updates this otherwise well-designed piece with off-the-shoulder seams. But this slight criticism was only noticeable under the weight of a heavy backpacking pack.


This top has a slim, athletic, and yet stylish fit that is as suited to a day on the mountain as heading into town. It appears to fit very true to size — a size Large perfectly suited the 5'11", 185lb, athletic frame of our head tester. We particularly appreciate that the well-cut arms end in cuffs that are supported by a slight elastic band. Unlike other tops in this review, the cuffs maintained their true shape longer, even when we continued to pull them up over our forearms.

meriwool merino 250 long sleeve base layer review - a 360-degree view of the handsome fit of the meriwool midweight...
A 360-degree view of the handsome fit of the Meriwool Midweight Thermal. Our head tester is 5'10", 155lbs, wearing a size medium.
Credit: Jill Rice

Drying Speed


As we have noted a few times already, what makes the Merino 250 a standout among otherwise very similar, midweight options is the extra-fine spun Merino wool. As with increased breathability, this also translates to slightly faster drying times. Although it is not nearly as quick-drying as the lightweight summer models we tested, there is a noticeable difference compared to its direct competition.


Indeed, the laboratory results from our soak n' dry test translated to what we experienced in the field while wearing this top as a base layer. Moisture was quickly wicked up and efficiently evaporated, keeping us dry and comfortable even through intense activity. The only exception to this was when backpacking — but without a suspended frame backpack, is it even a reasonable assumption to end the day without a sweaty back?

meriwool merino 250 long sleeve base layer review - similar to more expensive brands, the meriwool has a hang-tag for...
Similar to more expensive brands, the Meriwool has a hang-tag for drying. We love this feature, especially for Merino tops, because it keeps them from developing odd stretch marks around the collar.
Credit: Jill Rice

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Durability


We had some initial doubts about the durability of this layer, again based on the underlying difference of the extra-fine spun Merino wool. As a natural fiber, Merino is not normally categorized as one of the more durable options for athletic attire. But through years of field testing wear-and-tear, we are coming around to a sense that this is more of a generalization.


Like other Merino tops tested, after our overly-aggressive abrasion test, the Meriwool showed some notable rips and tears. In the real world, some lumps and bumps were accrued mountain biking in this top. That said, thanks to flatlock seams backing up the high-quality construction of this layer, it is more likely to meet an early fate through improper washing and drying than it is through outdoor activity — as long as you keep the rubber side down and don't manage to land upside down into a tree.

meriwool merino 250 long sleeve base layer review - breathable enough to tackle the uphill, and still strong enough to...
Breathable enough to tackle the uphill, and still strong enough to impress our testers.
Credit: Jill Rice

Layering Ability


As an athletically cut base layer, the Merino 250 layers well with most mid-layers we tried. From sweaters to lightweight puffy's, this slim fit top allows for a comfortable range of motion in every circumstance, making it both versatile and practical. The fine Merino wool may catch on the scratchiest of mid-layers or tough canvas jackets. Although it doesn't involve layering directly, we received more than one compliment when wearing this top.


Since this top is designed first and foremost as a base layer, we certainly did not knock it too much for its inability to have layers beneath it comfortably. We simply found that even while wearing a t-shirt, the upper arms become way too tight, verging on the point of restricting some particular movements. This isn't a problem specific to the Meriwool, but we tested other similarly weighted tops that were cut a bit looser and didn't present this problem.

meriwool merino 250 long sleeve base layer review - comfortably layered underneath a thick sweater, this base layer is...
Comfortably layered underneath a thick sweater, this base layer is sure to help keep you warm around the campfire.
Credit: Jill Rice

Should You Buy the Meriwool Merino 250 Long Sleeve?


For the price of entry, this layer is truly exceptional: a quality, 100% Merino wool base layer at a fraction of the cost of every other Merino layer we tested and researched. We were happy and a little surprised to report that this top's performance exceeds its price tag, offering great value and more affordable thermoregulation. Other tops may have more performance-driven features, but this top keeps things simple to deliver you a quality and reasonably priced product. If you're looking to experience for yourself just why Merino products are hyped as must-haves when it comes to technical base layers, the Meriwool Merino 250 is an excellent choice to seriously consider.

meriwool merino 250 long sleeve base layer review - you might expect some concessions based on cost alone, but this...
You might expect some concessions based on cost alone, but this quality top performs nearly as well as our top-contenders for a much more reasonable price.
Credit: Jill Rice

What Other Base Layers Should You Consider?


If the warmth of the Meriwool is what's most appealing to you and you're looking to level up your warmth game in comfort and fit especially, you can't go wrong with either the Smartwool Classic Thermal Merino 1/4 Zip or the Ortovox 185 Rock'N'Wool Long-Sleeve Compared to the Meriwool, the price difference for either of these phenomenal tops is not insignificant, especially if you're just getting cozy with the Meriwool's affordability. If your budget doesn't budge that much, consider a slightly lighter base layer like the REI Co-op Merino 185 Long-Sleeve Half-Zip, an extremely well-crafted base layer that'll last you many seasons of use. If the durability of a wool base layer in general is a concern, the synthetic Under Armour ColdGear Base 4.0 Crew is a warm base layer that can take a lot more abuse than any other thermal base layer we've tested.

meriwool merino 250 long sleeve base layer review - waking up at sunrise to tackle a long-approached alpine climb. make...
Waking up at sunrise to tackle a long-approached alpine climb. Make sure you don't hit the snooze button on buying this top-quality Merino base layer.
Credit: Jill Rice

Aaron Rice and Justin Simoni
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