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Men's Underwear

(159 products)

Products (159)

Sort: Best Match

SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$92.73
Save 28%
compared to $130.00
10 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
$90.00 - $100.00
93 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Men's
$89.00
87 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Arc'teryxRho SV Zip-Neck Base Layer Top - Men's
$140.00
7 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Men's
$130.00
31 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
Icebreaker260 Merino Tech Thermal Leggings with Fly - Men's
$125.00
68 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men's
$99.00
66 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's
$90.00
21 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
SmartwoolClassic Thermal Merino 3/4 Base Layer Bottoms - Men's
$105.00
85 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SaxxVibe Xtra Soft Comfort Boxer Briefs - Men's
$24.73
Save 27%
compared to $34.00
0 reviews
Size Type:
Regular, Big
REI OUTLET
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's
$104.95
20 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
Arc'teryxRho SV Base Layer Bottoms - Men's
$120.00
0 reviews
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Top Rated
REI Co-opLightweight Crew Base Layer Top - Men's
$19.93 - $34.95
23 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opLightweight Half-Zip Base Layer Top - Men's
$29.93 - $49.95
17 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
SaxxQuest Quick-Dry Boxer Briefs - Men's
$34.00
0 reviews
Size Type:
Regular, Big
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$130.00
192 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolClassic All-Season Merino T-Shirt - Men's
$80.00 - $95.00
94 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Arc'teryxRho LT Base Layer Bottoms - Men's
$100.00
57 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
SmartwoolIntraknit Thermal Merino Base Layer Quarter-Zip Top - Men's
$140.00
14 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
Arc'teryxRho Merino Wool Crew Neck Base Layer Top - Men's
$120.00
43 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
Arc'teryxRho Insulated 3/4 Base Layer Bottoms - Men's
$159.73
Save 20%
compared to $200.00
12 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's
$95.00
7 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
PatagoniaCapilene Thermal Weight Zip-Neck Top - Men's
$109.00
23 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Top Rated
IcebreakerMerino 125 ZoneKnit Long-Sleeve Half-Zip Base Layer Top - Men's
$99.73
Save 26%
compared to $135.00
14 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Men's
$135.00
42 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
IcebreakerMerino 200 ZoneKnit Long-Sleeve Half-Zip Base Layer Top - Men's
$119.73
Save 25%
compared to $160.00
4 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Men's
$115.00
34 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Icebreaker200 Oasis Crewe Base Layer Top - Men's
$95.00
42 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI Co-opMerino 185 Base Layer Top - Men's
$69.95
58 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI Co-opEveryday Boxers - Men's
$24.95
133 reviews with an average rating of 4.2 out of 5 stars
Size Type:
Regular, Big

31–60 of 159 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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