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Underwear

(489 products)

Products (489)

Sort: Best Match

Top Rated
REI Co-opLightweight Crew Base Layer Top - Men's
$29.95
5 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
$105.00
120 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Women's
$49.83 - $99.95
25 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Top Rated
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women's
$49.83 - $104.95
18 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Top Rated
Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Men's
$115.00
17 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
REI Co-opLightweight Base Layer Bottoms - Men's
$39.95
6 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's
$44.83 - $89.95
96 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
SmartwoolIntraknit Active Base Layer Bottoms - Women's
$54.83 - $110.00
5 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
The North FaceSummit Series Pro 120 Base Layer Tights - Women's
$100.00
13 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Ultralightweight
Size Type:
Regular, Plus
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's
$99.00
28 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
PatagoniaCapilene Thermal Weight Long Underwear Crew Top - Men's
$99.00
10 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
Kari TraaFryd Base Layer Pants - Women's
$29.83 - $60.00
15 reviews with an average rating of 3.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
REI Co-opMidweight Base Layer Bottoms - Kids'
$34.95
8 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Men's
$130.00
21 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Kari TraaFryd Base Layer Top - Women's
$29.83 - $60.00
22 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
SmartwoolActive Crop Bra
$75.00
1 reviews with an average rating of 1.0 out of 5 stars
Bra Support:
Low Impact
Support Style:
Compression
Fabric:
Main: 87% nylon/13% elastane (exclusive of decoration)
OiselleBoom Bra - Women's
$78.00
0 reviews
Bra Support:
High Impact
Support Style:
Compression / Encapsulation
Fabric:
78% polyester/22% LYCRA spandex
Top Rated
Arc'teryxIonia Merino Wool Base Layer Top - Men's
$90.00
37 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
PatagoniaCapilene Thermal Weight Zip-Neck Long Underwear Top - Women's
$109.00
14 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
PatagoniaCapilene Midweight Base Layer Bottoms - Kids'
$39.00
5 reviews with an average rating of 2.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
REI Co-opMidweight Base Layer Crew Top - Kids'
$34.95
5 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
$59.83 - $120.00
15 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Ortovox230 Competition Zip-Neck Base Layer Top - Men's
$120.00
3 reviews with an average rating of 3.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI Co-opMerino 185 Base Layer Bottoms - Men's Tall Sizes
$79.95
13 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Tall, Big
PatagoniaCapilene Midweight Crew Base Layer Top - Kids'
$39.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
REI Co-opMerino Midweight Base Layer Crew Top - Kids'
$49.95
25 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
New arrival
REI Co-opActive Pursuits Crop Tank Top - Women's
$44.95
0 reviews
Bra Support:
Low Impact
Support Style:
Compression
Fabric:
86% recycled polyester/14% spandex (bluesign approved)
Top Rated
REI Co-opMerino Midweight Base Layer Bottoms - Kids'
$49.95
15 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Panache SportEndurance Wired Sports Bra
$75.00
8 reviews with an average rating of 4.4 out of 5 stars
Bra Support:
High Impact
Support Style:
Encapsulation
Fabric:
49% polyamide/29% polyester/19% LYCRA Adaptiv/2% TACTEL/1% elastane
Helly HansenHH Durawool T-Shirt - Women's
$80.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular

121–150 of 489 products

Sort: Best Match

Related Expert Advice articles

What material is best?

Wool is moisture-wicking and odor-resistant, while synthetic fabrics are more durable and less expensive.

Match the temp to the trek

Lightweight layers are best for moderate to cool temperatures. Midweight layers are best for cold temperatures. Heavyweight layers are best for below-freezing temperatures.

Find your fit

To be able to wick sweat efficiently, your next-to-skin layer needs to actually be next to your skin. A comfortably snug fit everywhere is your goal.

Read full article: How to Choose Base Layers

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