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Classic All Season Merino Wool Blend Base Layer Bottoms

Smartwool

Current Price $100.00
Color
Color: Iron Heather
The brand says this runs true to size.
Size
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Details & care

Soft, breathable merino wool enhances the all-activity comfort of base-layer leggings that naturally regulate your body's temperature to help you stay dry and odor-free. A touch of nylon enhances the durability, while flatlock seams reduce chafing and allow for easier movement.

  • Elastic waistband
  • Functional fly
  • Merino wool naturally resists odors and helps regulate body temperature for comfort
  • 88% merino wool, 12% nylon
  • Machine wash, tumble dry
  • Imported
  • Item #10762486
  • Core Product ID 333333T7NN

Size info

  • The brand says this runs true to size.
  • Waist sizing; S=29-31", M=32-34", L=35-37", XL=38-40", XXL=41-44".
  • 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

(159)1594.6 out of 5
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Most helpful positive review

Oct 6, 2026

Active base-layer

Great base layer for cooler shoulder season hikes/paddles and more active winter ski tours when you don’t want to sweat through the heavier weight layer. Nice feel and quick to dry.
Ian
Reposted from Smartwool

Most helpful critical review

Nov 18, 2025

developed runs quickly- warranty is vague and unhelpful

I used these, seasonally, undefr my pants when the weather was cool enough to warrant the extra layer. They offered said warmth in the mornings without being too hot later on in the day. A very nice weight. MY ISSUE: they reapidly developed runs in the thighs and knees the first Sprung I bought them. This winter I pulled them back out and the runs have been getting bigger very quickly- Smartwool calls this regular wear and tear thus will not offer a replacement. So to me- this says they can't stand behind there prodocts anymore either. Thought they used to boast about the warranty?
JENNIFER W.
Reposted from Smartwool

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5 stars81%
4 stars9%
3 stars4%
2 stars3%
1 star3%
Oct 6, 2026

Active base-layer

Great base layer for cooler shoulder season hikes/paddles and more active winter ski tours when you don’t want to sweat through the heavier weight layer. Nice feel and quick to dry.
Reposted from Smartwool
Ian
Apr 11, 2026

Love my Smartwool Base Bottoms!

I snowboard in the Smartwool Base Layer bottoms regardless of temperature. I've never been cold or hot regardless of the conditions.
Reposted from Smartwool
Jody
Feb 21, 2026

The best lightweight baselayer

These are great baselayers, lightweight, I use them more to control sweating than warmth, better than any synthetic I've ever tried.
Reposted from Smartwool
Mike
Feb 17, 2026

These are incredible!

I use these when the temps start warming up in the spring and they are awesome. Seriously, where have they been all my life??
Reposted from Smartwool
Josh
Feb 16, 2026

Perfect layer

These bottoms are the perfect layer. I wear them most days in the winter for that extra warm and cozy feel. I work outside alot in the winter going to different building construction sites. When I have these on, I'm warm no matter how cold it is.
Reposted from Smartwool
Tom
Feb 4, 2026

Great for working outside and durable enough to last awhile

I use this for working outside, for hunting/fishing, and for running when the weather is a little more chilly. This layer is thin enough to allow me to work hard and sweat without making me feel like im cooking, but warm enough to be a great winter baselayer.
Reposted from Smartwool
Colson

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