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Underwear

(595 products)

Products (595)

Sort: Best Match

PatagoniaCapilene Midweight Crew Base Layer Top - Kids'
$39.00
1 reviews with an average rating of 5.0 out of 5 stars
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
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's
$90.93 - $130.00
187 reviews with an average rating of 4.2 out of 5 stars
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Women's
$66.83 - $135.00
20 reviews with an average rating of 4.7 out of 5 stars
Kari TraaRose Capri High-Waist Base Layer Bottoms - Women's
$49.83 - $100.00
0 reviews
Helly HansenLifa Merino Midweight Half-Zip Base Layer Top - Men's
$110.00
4 reviews with an average rating of 4.8 out of 5 stars
PatagoniaLive Simply Bra
$55.00
0 reviews
REI Co-opMerino Boxers - Men's
$39.95
63 reviews with an average rating of 4.3 out of 5 stars
Helly HansenLIFA Merino Midweight Graphic Base Layer Pants - Women's
$81.93 - $110.00
1 reviews with an average rating of 1.0 out of 5 stars
Panache SportEndurance Wired Sports Bra
$36.83 - $75.00
8 reviews with an average rating of 4.4 out of 5 stars
Top Rated
Arc'teryxRho LT Zip-Neck Base Layer Top - Men's
$95.93 - $120.00
90 reviews with an average rating of 4.6 out of 5 stars
Arms of Andes300 Lightweight Alpaca Wool Base Layer Leggings - Men's
$105.00
12 reviews with an average rating of 4.3 out of 5 stars
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's Tall Sizes
$79.95
8 reviews with an average rating of 4.9 out of 5 stars
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's Tall Sizes
$89.95
13 reviews with an average rating of 4.9 out of 5 stars
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's
$49.83 - $99.95
20 reviews with an average rating of 4.3 out of 5 stars
OnPerformance Flex Bra
$51.93 - $75.00
4 reviews with an average rating of 5.0 out of 5 stars
Arms of Andes160 Ultralight Alpaca Wool Long-Sleeve Base Layer Shirt - Women's
$85.00 - $100.00
11 reviews with an average rating of 3.8 out of 5 stars
Ortovox230 Competition Long-Sleeve Base Layer Top - Men's
$110.00
2 reviews with an average rating of 3.5 out of 5 stars
Top Rated
Icebreaker260 Tech Long-Sleeve Crewe Base Layer Top - Women's
$61.83 - $125.00
31 reviews with an average rating of 4.6 out of 5 stars
Top Rated
Kari TraaRose Half-Zip Base Layer Top - Women's
$59.83 - $120.00
48 reviews with an average rating of 4.5 out of 5 stars
BrooksPlunge 3.0 Sports Bra
$45.00
36 reviews with an average rating of 4.1 out of 5 stars
Arms of Andes300 Lightweight Alpaca Wool Pullover Base Layer Hoodie - Women's
$140.00
1 reviews with an average rating of 5.0 out of 5 stars
REI Co-opActive Thong Underwear - Women's
$14.95
15 reviews with an average rating of 4.5 out of 5 stars
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
Ortovox185 Merino Rock'n'wool Long-Sleeve Base Layer Top - Men's
$110.00
10 reviews with an average rating of 4.2 out of 5 stars
Top Rated
Arc'teryxRho LT Crew Neck Base Layer Top - Men's
$79.93 - $100.00
26 reviews with an average rating of 4.8 out of 5 stars
OiselleFlyout Bra
$68.00
2 reviews with an average rating of 4.5 out of 5 stars
Helly HansenLIFA Merino Midweight Graphic Base Layer Crew Top - Women's
$110.00
1 reviews with an average rating of 5.0 out of 5 stars
REI Co-opMerino Thong Underwear - Women's
$24.95
31 reviews with an average rating of 4.1 out of 5 stars
SmartwoolIntraknit Strappy Bra
$75.00
1 reviews with an average rating of 3.0 out of 5 stars

151–180 of 595 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