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Long Underwear

(411 products)

Products (411)

Sort: Best Match

Top Rated
REI Co-opLightweight Base Layer Bottoms - Men's
$39.95
5 reviews with an average rating of 5.0 out of 5 stars
Top Rated
REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
$54.95
150 reviews with an average rating of 4.5 out of 5 stars
Arc'teryxRho Base Layer Bottoms - Women's
$24.83 - $100.00
28 reviews with an average rating of 4.0 out of 5 stars
Arc'teryxRho LT Base Layer Bottoms - Men's
$80.93 - $100.00
45 reviews with an average rating of 4.4 out of 5 stars
REI Co-opMidweight Base Layer Tights - Women's
$54.95
89 reviews with an average rating of 4.1 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
tasc PerformanceElevation Merino Base Layer Bottoms - Women's
$54.73
Save 30%
compared to $79.00
51 reviews with an average rating of 4.1 out of 5 stars
REI OUTLET
REI Co-opMerino 185 Base Layer Bottoms - Men's
$39.83 - $79.95
120 reviews with an average rating of 4.4 out of 5 stars
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's
$39.83 - $79.95
193 reviews with an average rating of 4.5 out of 5 stars
SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's
$56.83 - $120.00
729 reviews with an average rating of 4.5 out of 5 stars
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
$79.95
163 reviews with an average rating of 4.5 out of 5 stars
REI Co-opMidweight Base Layer Bottoms - Men's
$54.95
77 reviews with an average rating of 4.4 out of 5 stars
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women's
$39.95
0 reviews
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
REI Co-opMerino 185 Base Layer Bottoms - Women's
$79.95
102 reviews with an average rating of 4.3 out of 5 stars
JanjiGroundwork Long Bra
$68.00
8 reviews with an average rating of 4.1 out of 5 stars
SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's
$90.00
18 reviews with an average rating of 4.1 out of 5 stars
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Women's
$95.00
1 reviews with an average rating of 5.0 out of 5 stars
Top Rated
Icebreaker260 Merino Tech Thermal Leggings with Fly - Men's
$125.00
48 reviews with an average rating of 4.5 out of 5 stars
REI Co-opLightweight Crew Base Layer Top - Women's
$29.95
0 reviews
REI Co-opLightweight Half-Zip Base Layer Top - Women's
$44.95
0 reviews
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women's
$83.93 - $120.00
24 reviews with an average rating of 4.9 out of 5 stars
IcebreakerMerino 200 Oasis Thermal Leggings - Women's
$105.00
64 reviews with an average rating of 4.4 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
Arc'teryxLana Merino Wool Crew Base Layer Top - Women's
$90.00
2 reviews with an average rating of 1.0 out of 5 stars
Top Rated
SmartwoolIntraknit Thermal Merino Base Layer Quarter-Zip Top - Men's
$97.93 - $140.00
10 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
$89.95
99 reviews with an average rating of 4.6 out of 5 stars
SmartwoolIntraknit Active Long-Sleeve Base Layer Top - Women's
$110.00
1 reviews with an average rating of 5.0 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
Arms of Andes300 Lightweight Alpaca Wool Half-Zip Base Layer Top - Men's
$135.00
13 reviews with an average rating of 3.8 out of 5 stars

1–30 of 411 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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