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Outdoor Underwear

(487 products)

Products (487)

Sort: Best Match

Beyond YogaSpacedye Outlines Bra
$70.00
0 reviews
Arms of Andes300 Lightweight Alpaca Wool Half-Zip Base Layer Top - Men's
$135.00
15 reviews with an average rating of 3.9 out of 5 stars
Arms of Andes300 Lightweight Alpaca Wool Half-Zip Base Layer Top - Women's
$115.00 - $135.00
8 reviews with an average rating of 3.8 out of 5 stars
prAnaTornado Bra
$64.00
0 reviews
PatagoniaCapilene Thermal Weight Zip-Neck Top - Men's
$109.00
18 reviews with an average rating of 4.0 out of 5 stars
SalomonSHKout Core Bra
$50.00
0 reviews
Icebreaker200 Oasis Crewe Base Layer Top - Men's
$95.00
29 reviews with an average rating of 4.5 out of 5 stars
REI Co-opMerino 185 Base Layer Bottoms - Women's Plus Sizes
$39.83 - $79.95
8 reviews with an average rating of 3.9 out of 5 stars
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's Plus Sizes
$79.95
26 reviews with an average rating of 4.5 out of 5 stars
New arrival
Beyond YogaImpulse Ribbed Bra
$70.00
5 reviews with an average rating of 4.0 out of 5 stars
The North FaceRefina Double-Layer Bra
$60.00
1 reviews with an average rating of 5.0 out of 5 stars
OnCore Bra - Women's
$50.00
1 reviews with an average rating of 5.0 out of 5 stars
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men's
$125.00
57 reviews with an average rating of 4.7 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
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Men's
$89.00
79 reviews with an average rating of 4.5 out of 5 stars
Kari TraaEmbla Wool Base Layer Top - Women's
$60.00
0 reviews
Kari TraaEmbla Wool Long-Sleeve Base Layer Top - Women's
$80.00
0 reviews
ALWRLDALRN Crop Bra
$58.00
0 reviews
Icebreaker125 ZoneKnit Base Layer Leggings - Men's
$125.00
0 reviews
Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Top - Men's
$125.00
4 reviews with an average rating of 5.0 out of 5 stars
Arms of Andes300 Alpaca Wool Long-Sleeve Crew Base Layer Top - Men's
$130.00
7 reviews with an average rating of 3.6 out of 5 stars
Top Rated
Icebreaker260 Merino Tech Thermal Leggings with Fly - Men's
$125.00
51 reviews with an average rating of 4.6 out of 5 stars
Arms of Andes160 Ultralight Alpaca Wool Long-Sleeve Base Layer Shirt - Men's
$85.00
9 reviews with an average rating of 3.9 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
Top Rated
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men's
$99.00
61 reviews with an average rating of 4.6 out of 5 stars
SmartwoolClassic All-Season Merino Base Layer Bottoms - Women's
$90.00
13 reviews with an average rating of 4.3 out of 5 stars
PatagoniaMaipo Low-Impact Bra
$59.00
3 reviews with an average rating of 3.3 out of 5 stars
prAnaHeavana Every Minute Bra
$58.00
0 reviews
PYNRSWarren Sports Bra
$65.00
4 reviews with an average rating of 5.0 out of 5 stars
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Men's
$135.00
34 reviews with an average rating of 4.5 out of 5 stars

61–90 of 487 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