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Meriwool Merino Thermal Pants - Women's Review

A merino wool pant that's warm, comfortable, and offers a great value
Meriwool Merino Thermal Pants - Women's
Credit: Amazon
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Price:  $60 List | $59.99 at Amazon
Pros:  Great value, very warm, breathable, cute color options, comfortable waistband, versatile fit
Cons:  Stretches out over time
Manufacturer:   Meriwool
By Amber King ⋅ Senior Review Editor  ⋅  Jun 7, 2022
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71
OVERALL
SCORE


RANKED
#8 of 10
  • Warmth - 30% 9.0
  • Breathability - 30% 6.0
  • Comfort and Fit - 30% 7.0
  • Durability - 10% 5.0

Our Verdict

If you're seeking a deal on a merino wool pant, the Meriwool Merino Thermal is one of our top recommendations. Built with 250 g/m² of 100% merino wool, this pant provides a wide range of thermoregulation. We tested it while hiking, running, and exploring our backyard well into the single digits. The soft and cozy fibers offer superior wicking properties, warmth, and breathability. It's sufficient to wear as your next-to-skin layer during the coldest days of winter in a layered system. Unfortunately, for us, it stretches out over time. However, we still think it's a great deal for a full merino wool base layer pant.

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Price $60 List
$59.99 at Amazon
$29.83 at REI
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Pros Great value, very warm, breathable, cute color options, comfortable waistband, versatile fitAffordable, stylish design, super comfortable, excellent fitAmazing breathability, comfortable on the skin, great fit, good warmth, cute colors and designsVery breathable, ultralight construction, quick drying, great snug fitSmooth and silky, good breathability, easy to wear on its own, cute and fitted style, affordable
Cons Stretches out over timeNot as breathable due to thicker waistband, welded seams aren't our favoriteLess durable than previous version, holds smell after timeNot as comfortable as merino fabricNot super durable, absorbs and holds water, stinky after a month of heavy use
Bottom Line A merino wool pant that's warm, comfortable, and offers a great valueA versatile synthetic bottom featuring modern style, unbelievable comfort, sufficient thermoregulation, and affordabilityA synthetic long underwear bottom with an all around impressive performance at a fair priceA highly breathable layer that dries quickly, making it exceptional for intense cool to cold weather activityA super inexpensive synthetic base layer option
Rating Categories Meriwool Merino The... Kari Traa Rulle Hig... Patagonia Capilene... Odlo Performance Li... REI Co-op Midweight...
Warmth (30%)
9.0
7.0
8.0
5.0
4.0
Breathability (30%)
6.0
7.0
7.0
9.0
8.0
Comfort and Fit (30%)
7.0
9.0
7.0
8.0
6.0
Durability (10%)
5.0
7.0
9.0
6.0
7.0
Specs Meriwool Merino The... Kari Traa Rulle Hig... Patagonia Capilene... Odlo Performance Li... REI Co-op Midweight...
Material 100% Merino wool 70% acrylic, 20% modal, 10% Merino wool 100% recycled polyester 69% polyester, 27% polyamide, 4% elastane 92% polyester, 8% spandex
Fabric Weight (g/m²) 250 g/m² N/A N/A N/A N/A
Weight Class Midweight Lightweight Midweight Lightweight Lightweight
Measured Weight (size medium) 7.8 oz 5.9 oz 5.6 oz 3.1 oz 6.4 oz
Cuts Avaliable Full length Full length Full length Full length Full length
Smelly Over Time? No No Yes No Yes
Odor Control Fabric Naturally odor resistant N/A HeiQ Fresh N/A N/A

Our Analysis and Test Results

The Meriwool Merino Pants are a 250 g/m² 100% merino wool option at an affordable price. Designed with a comfortable and stretchy fit, this pant will fight to keep your body dry in cold temperatures. Wear it through cool to cold weather under a pair of snow pants or on its own. For the price, you'll be hard-pressed to find a better deal.

Performance Comparison


Meriwool Merino Thermal Pants - Women's long underwear - this 100% merino wool pant is a great deal. wear it under a skirt or...
This 100% merino wool pant is a great deal. Wear it under a skirt or pair of pants for excellent warmth during cold weather. Just know that it will stretch out.
Credit: Amber King

Warmth


Loaded with 250 g/m² of 100% merino wool, this midweight thermal pant is warm and thick enough to be easily worn with uninsulated or insulated pants. We tested it in single-digit temperatures as a layered system and on its own. Through all circumstances, it kept us as warm as other options with the same fabric and weight.

Meriwool Merino Thermal Pants - Women's long underwear - our lead tester discusses animal adaptations in our local forest...
Our lead tester discusses animal adaptations in our local forest school when temperatures are below 10 degrees F. Under her pants are the Meriwool Merino Thermals that kept her warm during this 7-hour stint in cold weather.
Credit: Amber King

We tested this pant while teaching all-day outdoors for three weeks during the late Fall to early Winter in Southwest Colorado. We wore them under varying outer layers through temperatures ranging from 0 to 65 degrees Fahrenheit. In all conditions, it did an excellent job moving moisture from the skin to keep us dry, keeping us warm in frigid conditions.

Meriwool Merino Thermal Pants - Women's long underwear - we test the warmth of this pant while taking a wintery hike as the...
We test the warmth of this pant while taking a wintery hike as the sun goes down in Ridgway, CO.
Credit: Amber King

We also wore these pants under a skirt while hiking and running in windy conditions during a mid-Fall weekend in Ouray, Colorado. As we hit 13,000 feet, the wind started to blow. The material weave of this fabric offered some wind resistance, keeping our skin toasty, even when worn on its own. The weave isn't super tight, but the fabric thickness is ample.

Meriwool Merino Thermal Pants - Women's long underwear - the materials of the meriwool are thick and offer great protection...
The materials of the Meriwool are thick and offer great protection from the wind. The warmth is comparable to our high performers, generating lots of heat while ventilating well.
Credit: Amber King

If you're planning on hitting the resort this winter or you're thinking of a winter camping expedition, this thicker base layer will provide ample warmth when layered appropriately with snow pants. For active sports, it's also a good choice, but only when the temperatures are pretty cold and upper layers have appropriate ventilation. And, if it gets wet, it still insulates due to the inherent properties of merino wool.

Breathability


This pant's thickness is average, with a medium to tight fabric weave. While the Meriwool is protective and warm from the wind, it still provides great breathability. When holding the pant up to the light, you can see the little holes in the fabric that offer great airflow. When worn on its own or with a well-ventilated pant, you'll feel nice and dry. That said, while it's breathable, it's not the most breathable option on the market, given that the fabrics are thicker than the lighter weight options we've tested.

Meriwool Merino Thermal Pants - Women's long underwear - holding these bottoms up to the light gives us insight into its...
Holding these bottoms up to the light gives us insight into its weave pattern and permeability.
Credit: Amber King

We tested this pant both on its own and in a layered system. Hiking up mountain ridges both underneath a fleece-lined soft pant and on its own up mountain ridges. In both conditions, when temperatures went from freezing to about 50°F, we still felt dry. Warm, yes, but not sweating. We also ran with this pant in 60 - 70°F weather for distances ranging from 5 miles to 15 miles. While we got hot and sweated, the fabric still moved moisture and kept our skin dry. Overall, this pant is breathable and offers a wide range of thermoregulation — similar to any pant made from 100% merino wool. However, it does heat up faster than other lighter contenders with a thinner construction.

Meriwool Merino Thermal Pants - Women's long underwear - we enjoy running and hiking on ridges in these pants! the temps were...
We enjoy running and hiking on ridges in these pants! The temps were warm while we hiked up and cooled on this 13,000 ft in Ouray, CO. This pant proves to insulate and breathe well.
Credit: Amber King

Comfort and Fit


The Meriwool Merino is super cozy and comfortable on the skin. Since it has a 100% merino wool construction, there is no itch, and it's ready for all-day wear. It also doesn't stink if you can't wash it for a few days. The only caveat is that it stretches out over time in our experience. The fit is true to size at first but stretches to be a bit larger. As a result, we'd recommend sizing down if you're in between sizes.

Meriwool Merino Thermal Pants - Women's long underwear - the waistband is elasticized and comfortable against the skin. the...
The waistband is elasticized and comfortable against the skin. The materials are soft and ready for all-day wear. This pant has a stretchy fit and unfortunately does not 'bounce back' even after a wash.
Credit: Amber King

On a hike-run adventure, we noticed after just a half-hour of activity that the fabrics began to stretch out. The fabric no longer sat tightly against our skin and sagged around the glutes and knees. We constantly had to pull them up and adjust to get a better fit.

A look at the fit after we pulled it up. Our tester is 5'6, 145 lbs...
A look at the fit after we pulled it up. Our tester is 5'6, 145 lbs wearing a size medium. This size felt a bit big for her athletic build, especially after stretching out.
A look at the fit from the back.
A look at the fit from the back.

Durability


This pant proved to have lackluster durability because it stretched out during our testing period. After just three weeks, the shape was completely different. We also washed the Meriwool several times and noticed some pilling after the first wash. However, we still don't see any serious holes or tears, even after some serious abuse directly to the face fabric. So, this pant didn't overwhelm us in this metric, but it passed our basic tests. If you seek a more durable construction, check out options made from synthetic materials, which typically feature more durable fibers.

Value


You'll be hard-pressed to find a better deal on a pair of super warm merino wool long john pants. While this pant stretches out with minimal use, it has the same range of thermoregulation and warmth as our top contenders at a fraction of the price. Our conclusion is that the value is exceptional and should be considered, especially if you're on a tight budget.

Conclusion


The Meriwool Merino Thermal Pant is a midweight 100% merino base layer pant with excellent value. While it eventually stretches out with use, you can still enjoy the cute colors and excellent performance at a wonderful price.

Meriwool Merino Thermal Pants - Women's long underwear - we enjoy this long underwear bottom for biking, hiking, and running...
We enjoy this long underwear bottom for biking, hiking, and running. We also will wear it through the winter as our next to skin choice while skiing at the resort. It presents an unbeatable value with a few caveats.
Credit: Amber King

Amber King
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