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Underwear

(513 products)

Products (513)

Sort: Best Match

Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Base Layer Crew Top - Kids'
$41.93 - $60.00
8 reviews with an average rating of 4.5 out of 5 stars
Arms of Andes160 Ultralight Alpaca Wool Crew Neck Base Layer T-Shirt - Women's
$75.00
2 reviews with an average rating of 5.0 out of 5 stars
Top Rated
Arms of Andes300 Lightweight Alpaca Wool Base Layer Leggings - Women's
$105.00
8 reviews with an average rating of 5.0 out of 5 stars
Ortovox120 Comp Light Short Base Layer Pants - Men's
$70.00
3 reviews with an average rating of 5.0 out of 5 stars
TerryCyclo Brief 2.0 Underwear Bottoms - Women's
$59.95
1 reviews with an average rating of 5.0 out of 5 stars
SmartwoolIntraknit Strappy Bra
$65.00
2 reviews with an average rating of 5.0 out of 5 stars
Top Rated
IcebreakerMerino 150 Tech Lite III Relaxed T-Shirt - Women's
$80.00
69 reviews with an average rating of 4.6 out of 5 stars
Top Rated
VuoriYosemite Bra
$58.00
19 reviews with an average rating of 4.7 out of 5 stars
Oya Femtech ApparelRemovable Inserts - Women's - Package of 4
$20.00
17 reviews with an average rating of 3.8 out of 5 stars
NRSH2Core Lightweight Union Suit - Men's
$109.95
2 reviews with an average rating of 3.0 out of 5 stars
REI Co-opMerino 185 Base Layer Top - Men's
$69.95
51 reviews with an average rating of 4.2 out of 5 stars
PatagoniaNether Bike Liner Shorts - Women's
$69.00
0 reviews
Oya Femtech ApparelHigh-Impact Front Zip Sports Bra
$55.00
7 reviews with an average rating of 4.1 out of 5 stars
SmartwoolIntraknit Bikini Underwear - Women's
$34.00
5 reviews with an average rating of 1.8 out of 5 stars
SmartwoolIntraknit Racerback Bra
$75.00
0 reviews
REI Co-opMerino Boxers - Men's
$39.95
65 reviews with an average rating of 4.3 out of 5 stars
SaxxDropTemp Cooling Mesh Boxer Briefs - Men's
$38.00
38 reviews with an average rating of 3.9 out of 5 stars
Top Rated
The North FaceSummit Series Pro 120 Crew Base Layer Top - Women's
$100.00
12 reviews with an average rating of 5.0 out of 5 stars
REI Co-opActive Hipster Underwear - Women's
$18.95
35 reviews with an average rating of 3.8 out of 5 stars
The North FaceFD Pro 160 Base Layer Tights - Women's
$70.00
47 reviews with an average rating of 4.2 out of 5 stars
REI Co-opEveryday Boxers - Men's
$22.95
116 reviews with an average rating of 4.2 out of 5 stars
Icebreaker125 Cool-Lite Merino Blend Sphere III Scoop T-Shirt - Women's
$75.00
17 reviews with an average rating of 4.2 out of 5 stars
BurtonMidweight X Base Layer Bottoms - Men's
$74.95
0 reviews
REI Co-opEveryday Briefs - Men's
$19.95
93 reviews with an average rating of 3.5 out of 5 stars
Ortovox120 Comp Light Base Layer Hoody - Men's
$120.00
2 reviews with an average rating of 5.0 out of 5 stars
SmartwoolIntraknit Racerback Bra
$65.00
3 reviews with an average rating of 3.0 out of 5 stars
Top Rated
tasc PerformanceElevation Merino T-Shirt - Women's
$49.73 - $54.73
Save 30% - 37%
compared to $79.00
75 reviews with an average rating of 4.6 out of 5 stars
REI OUTLET
SaxxQuest Boxer Briefs - Men's
$24.73
Save 27%
compared to $34.00
2 reviews with an average rating of 5.0 out of 5 stars
REI OUTLET
New arrival
Arc'teryxRho Heavyweight Zip-Neck Base Layer Top - Men's
$112.73
Save 19%
compared to $140.00
0 reviews
REI OUTLET
Helly HansenHH Durawool Graphic T-Shirt - Women's
$90.00
0 reviews

181–210 of 513 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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