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Men's Underwear

(190 products)

Products (190)

Sort: Best Match

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
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$130.00
188 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
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
Underwear Weight:
Lightweight
Size Type:
Regular, Big
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
Underwear Weight:
Lightweight
Size Type:
Tall
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
Underwear Weight:
Lightweight
Size Type:
Tall
Ortovox230 Competition Long-Sleeve Base Layer Top - Men's
$110.00
2 reviews with an average rating of 3.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Icebreaker150 Anatomica Crewe Base Layer Top - Men's
$75.00
10 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
Arc'teryxRho LT Crew Neck Base Layer Top - Men's
$59.83 - $100.00
27 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
Arc'teryxRho LT Zip-Neck Base Layer Top - Men's
$84.83 - $120.00
90 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Helly HansenLifa Merino Midweight Base Layer Pants - Men's
$100.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Big
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's
$49.83 - $99.95
21 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
Ortovox120 Comp Light Short Base Layer Pants - Men's
$70.00
3 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
NRSH2Core Lightweight Union Suit - Men's
$109.95
2 reviews with an average rating of 3.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI Co-opMerino 185 Base Layer Top - Men's
$48.93 - $69.95
52 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
SaxxDropTemp Cooling Mesh Boxer Briefs - Men's
$38.00
38 reviews with an average rating of 3.9 out of 5 stars
Size Type:
Regular
BurtonMidweight X Base Layer Bottoms - Men's
$74.95
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI Co-opEveryday Briefs - Men's
$19.95
93 reviews with an average rating of 3.5 out of 5 stars
Size Type:
Regular
Ortovox120 Comp Light Base Layer Hoody - Men's
$120.00
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
Arc'teryxRho Merino Wool Crew Neck Base Layer Top - Men's
$84.83 - $120.00
27 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Big, Regular
Ortovox230 Competition Long Base Layer Pants - Men's
$100.00
1 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Ortovox185 Rock'n'wool Long Base Layer Pants - Men's
$110.00
4 reviews with an average rating of 3.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Big
New arrival
SaxxKinetic Light-Compression Mesh Boxer Brief
$28.73
Save 24%
compared to $38.00
0 reviews
Size Type:
Regular
REI OUTLET
Royal RobbinsReadyDry Crew T-Shirt - Men's
$26.73
Save 33%
compared to $40.00
0 reviews
REI OUTLET
StanceTwo Tone Boxer Briefs - Men's
$22.73
Save 24%
compared to $30.00
0 reviews
Size Type:
Regular
REI OUTLET
StanceTubeular Boxer Briefs - Men's
$18.73
Save 25%
compared to $25.00
0 reviews
Size Type:
Regular
REI OUTLET
StanceThe Vacationeer Boxer Briefs - Men's
$19.73
Save 26%
compared to $27.00
0 reviews
Size Type:
Regular
REI OUTLET
StanceSunrise Boxer Briefs - Men's
$18.73
Save 25%
compared to $25.00
0 reviews
Size Type:
Regular
REI OUTLET
StanceSandy Beach Boxer Briefs - Men's
$19.73
Save 26%
compared to $27.00
0 reviews
Size Type:
Regular
REI OUTLET
StanceRamp Camo Boxer Briefs - Men's
$22.73
Save 24%
compared to $30.00
0 reviews
Size Type:
Regular
REI OUTLET
StancePoppyland Boxer Briefs - Men's
$18.73
Save 25%
compared to $25.00
0 reviews
Size Type:
Regular
REI OUTLET

61–90 of 190 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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