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Men's Underwear

(201 products)

Products (201)

Sort: Best Match

SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$92.73
Save 28%
compared to $130.00
9 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$105.00
163 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SaxxVolt Breathable Mesh Boxer Briefs - Men's
$26.73
Save 23%
compared to $35.00
6 reviews with an average rating of 4.0 out of 5 stars
Size Type:
Regular, Big
REI OUTLET
Top Rated
Helly HansenLIFA Merino Midweight Half-Zip Base Layer Top - Men's
$79.73
Save 27%
compared to $110.00
5 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
Arc'teryxRho Merino Wool Crew Neck Base Layer Top - Men's
$120.00
31 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
Arc'teryxRho LT Zip-Neck Base Layer Top - Men's
$120.00
97 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
Free CountryCloud Knit Crewneck Base Layer Top - Men's
$26.73
Save 33%
compared to $40.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's
$90.00
20 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
PatagoniaCapilene Midweight Base Layer Bottoms - Men's
$89.00
58 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$78.73
Save 25%
compared to $105.00
66 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
Top Rated
IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men's
$105.00
62 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Free CountryForce Grid Fleece Base Layer Top - Men's
$29.73
Save 33%
compared to $45.00
4 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's
$104.95
15 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
Top Rated
ExOfficioGive-N-Go 2.0 Boxer Briefs - Men's
$22.73
Save 24%
compared to $30.00
2904 reviews with an average rating of 4.5 out of 5 stars
Size Type:
Regular, Big
REI OUTLET
New arrival
Arc'teryxRho LT Crew Neck Base Layer Top - Men's
$79.73
Save 20%
compared to $100.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Men's
$89.73
Save 25%
compared to $120.00
25 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
SaxxRoast Master Midweight Base Layer Bottoms - Men's
$47.73
Save 36%
compared to $75.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Free CountryForce Grid Fleece Base Layer Bottoms - Men's
$29.73
Save 33%
compared to $45.00
8 reviews with an average rating of 3.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
ExOfficio9" GNG Sport 2.0 Boxer Briefs - Men's
$24.73
Save 27%
compared to $34.00
528 reviews with an average rating of 4.7 out of 5 stars
Size Type:
Regular
REI OUTLET
REI Co-opMerino 185 Base Layer Top - Men's
$69.95
54 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men's
$125.00
62 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
PatagoniaCapilene Thermal Weight Long-Underwear Bottoms - Men's
$99.00
14 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$130.00
189 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
StanceGrape Boxer Briefs - Men's
$19.73
Save 34%
compared to $30.00
0 reviews
Size Type:
Regular
REI OUTLET
PatagoniaCapilene Thermal Weight Long Underwear Crew Top - Men's
$99.00
10 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Top Rated
Icebreaker260 Merino Tech Thermal Leggings with Fly - Men's
$125.00
57 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
New arrival
StanceWild Ones Boxer Briefs - Men's - Package of 2
$29.73
Save 33%
compared to $45.00
0 reviews
Size Type:
Regular
REI OUTLET
SmartwoolClassic All-Season Merino T-Shirt - Men's
$80.00
87 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men's
$99.00
64 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
New arrival
StanceTropiskull Boxer Briefs - Men's
$16.73
Save 33%
compared to $25.00
0 reviews
Size Type:
Regular
REI OUTLET

31–60 of 201 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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