loaded 488 results

Outdoor Underwear

(488 products)

Products (488)

Sort: Best Match

Top Rated
REI Co-opMidweight Base Layer Half-Zip Top - Men's
$29.83 - $59.95
132 reviews with an average rating of 4.6 out of 5 stars
Top Rated
Arc'teryxRho Zip-Neck Base Layer Top - Women's
$120.00
34 reviews with an average rating of 4.8 out of 5 stars
NikeIndy Light Support Bra
$38.00
31 reviews with an average rating of 4.1 out of 5 stars
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Women's
$89.00
45 reviews with an average rating of 4.6 out of 5 stars
rabbitUtiliBRA-vo Sports Bra
$50.00 - $55.00
18 reviews with an average rating of 4.4 out of 5 stars
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$105.00
121 reviews with an average rating of 4.7 out of 5 stars
Beyond YogaSpacedye Simplicity Long Bra
$70.00
31 reviews with an average rating of 4.4 out of 5 stars
SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's
$130.00
27 reviews with an average rating of 4.3 out of 5 stars
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
$89.95
103 reviews with an average rating of 4.6 out of 5 stars
Arc'teryxLana Merino Wool Crew Base Layer Top - Women's
$90.00
5 reviews with an average rating of 2.2 out of 5 stars
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes
$44.83 - $89.95
16 reviews with an average rating of 4.5 out of 5 stars
REI Co-opLightweight Base Layer Tights - Women's
$39.95
1 reviews with an average rating of 5.0 out of 5 stars
Top Rated
Arc'teryxIonia Merino Wool Base Layer Hoody - Men's
$140.00
49 reviews with an average rating of 4.9 out of 5 stars
PatagoniaCapilene Midweight Base Layer Bottoms - Women's
$89.00
25 reviews with an average rating of 4.1 out of 5 stars
SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's Plus Sizes
$115.00 - $120.00
19 reviews with an average rating of 4.4 out of 5 stars
PatagoniaShadowlite Mid-Impact Bra
$69.00
0 reviews
SmartwoolIntraknit Active Long-Sleeve Base Layer Top - Women's
$110.00
1 reviews with an average rating of 5.0 out of 5 stars
prAnaTornado Bra
$64.00
0 reviews
IcebreakerMerino 200 Oasis Thermal Leggings - Women's
$105.00
66 reviews with an average rating of 4.4 out of 5 stars
BrooksPlunge 3.0 Sports Bra
$45.00
38 reviews with an average rating of 4.0 out of 5 stars
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women's
$83.93 - $120.00
26 reviews with an average rating of 4.8 out of 5 stars
REI Co-opMerino 185 Base Layer Top - Women's Plus Sizes
$16.83 - $69.95
20 reviews with an average rating of 3.8 out of 5 stars
Arms of Andes160 Ultralight Alpaca Wool Base Layer Leggings - Men's
$85.00
2 reviews with an average rating of 5.0 out of 5 stars
Panache SportBoundless Non Wired Sports Bra
$71.00
18 reviews with an average rating of 4.3 out of 5 stars
BrooksCrossback 2.0 Sports Bra
$17.83 - $65.00
465 reviews with an average rating of 4.0 out of 5 stars
SmartwoolClassic All-Season Merino 3/4 Base Layer Bottoms - Men's
$75.00
2 reviews with an average rating of 5.0 out of 5 stars
Top Rated
SmartwoolClassic Thermal Merino 3/4 Base Layer Bottoms - Men's
$105.00
84 reviews with an average rating of 4.7 out of 5 stars
PatagoniaCapilene Thermal Weight Long-Underwear Bottoms - Men's
$99.00
14 reviews with an average rating of 4.0 out of 5 stars
Panache SportFreedom Bra
$75.00
0 reviews
OiselleSquared Up Bra
$64.00
0 reviews

31–60 of 488 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