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Classic Thermal Wool Blend Base Layer Leggings video
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Classic Thermal Wool Blend Base Layer Leggings

Smartwool

Current Price $100.00
Color
Color: Black
Size
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Cardmembers get a $20 Note for every $200 spent!  Ends Sunday, Oct. 25.  Apply Now & See Details

Details & care

Made from a lightweight wool blend, these leggings feature an updated fit with flatlock seams to keep you comfortably moving through every cold-weather activity.

  • 30 1/2" inseam
  • Elastic waist
  • Smooth flatlock seaming designed to eliminate rubbing and irritation
  • Merino wool naturally resists odors and helps regulate body temperature for comfort
  • 88% merino wool, 12% nylon
  • Machine wash, tumble dry
  • Imported
  • Item #10518859
  • Core Product ID 333333KQ42

Size info

  • XS=0-2, S=4-6, M=8-10, L=12-14, XL=16-18.
  • Get the fit you want. Book an appointment with our onsite experts or stop by your nearest store.

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Smartwool

Smartwool was launched in 1994 in Steamboat Springs, Colorado, and initially specialized in performance socks made of Merino wool. Today the company continues to push the boundaries of Merino to create smarter, more capable outdoor apparel from head to toe. Built on the desire to be comfortable outside, Smartwool exists to help people play, live and laugh in the great outdoors.

Reviews

(124)1244.4 out of 5
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Most helpful positive review

June 3, 2026

Warm, dry, and cozy.

My new go-to warmth! My all season classic base layer is lightweight to fit under my jeans providing me with comfortable warmth on cold/cool damp days. I have a seasonal job in an unheated building by a lake. Because they breathe, I can wear these all day to stay warm and dry.
Jean G.
Reposted from Smartwool

Most helpful critical review

Aug 18, 2024

Weird fit and completely see-thru

Bought these for a hiking trip after multiple recommendations. Was very displeased with how incredibly thin and completely see-thru these pants were. Additionally, the waist was too large. I'm glad I tried them on/walked around the house in them before my trip because they kept sliding down which would have driven my CRAZY. Maybe would have been better with a higher waisted design? Returned immediately
Emily
Reposted from Smartwool
Smartwool response
Thank you for sharing your experience with us. We are sorry to hear that the fit was not right for you. We are glad that you were able to take advantage of our Go Far. Feel Good.:tm: Guarantee. The base layer is a popular product for providing extra warmth under other clothing. However, in this case, we would recommend our leggings: https://www.smartwool.com/en-us/women/apparel/bottoms/womens-active-legging/SW016934.html?dwvar_SW016934_color=541

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5 stars70%
4 stars12%
3 stars9%
2 stars3%
1 star6%
June 3, 2026

Warm, dry, and cozy.

My new go-to warmth! My all season classic base layer is lightweight to fit under my jeans providing me with comfortable warmth on cold/cool damp days. I have a seasonal job in an unheated building by a lake. Because they breathe, I can wear these all day to stay warm and dry.
Reposted from Smartwool
Jean G.
Apr 19, 2026

Soft, comfy leggins

These leggings are soft and warm. The only down side is a looser fit than I would like for a S size.
Reposted from Smartwool
Alma
Apr 19, 2026

Good base layer, but the rise should be longer.

I'm 5' 8"", 150lbs. I ordered the Base Layer in a medium/black. I like the weight and comfort. However, the waist sits low; the rise could be longer. Please give us tall gals more options! I also ordered the Thermal Base Layer in medium/black and was disappointed because the waist sat so low that I had to return them. They also felt like they ran small compared to the Base Layer pair.
Reposted from Smartwool
Jena
Apr 4, 2026

I

All I can write that the two pieces I purchased were Perfect! I hope the company does not change their product.
Reposted from Smartwool
Laurel
Apr 4, 2026

Have been living in these pants ever since I bought them

I truly love these pants! It's been hard to convince myself to change into other pants. I purchased them during a particularly cold winter, and they were perfect to wear under other layers, keeping me warm. But they've also been great for just lounging around the house! I love that they are wool instead of synthetic materials.
Reposted from Smartwool
Caroline
Apr 3, 2026

Recommend!

Elastic is not that strong. Very comfy and great style. The material is good. The length is perfect for me. Purchased L and I'm 5'11 175 lb
Reposted from Smartwool
Jen

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