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Men's Underwear

(142 products)

Products (142)

Sort: Best Match

SmartwoolClassic All-Season Merino T-Shirt - Men's
$95.00
94 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
StanceIn The Wild Wholester Boxer Briefs - Men's
$24.73
Save 29%
compared to $35.00
0 reviews
Size Type:
Regular
REI OUTLET
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
Royal RobbinsReadyDry Crew T-Shirt - Men's
$26.73
Save 33%
compared to $40.00
2 reviews with an average rating of 5.0 out of 5 stars
REI OUTLET
Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Men's
$84.73
Save 26%
compared to $115.00
7 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
Icebreaker200 Sonebula Leggings - Men's
$89.73
Save 25%
compared to $120.00
5 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
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
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
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's Tall Sizes
$89.95
14 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Tall
SmartwoolIntraknit Thermal Merino Base Layer Colorblock Crew - Men's
$96.73
Save 25%
compared to $130.00
15 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
SaxxRoast Master Midweight Long-Sleeve Crew Base Layer Top - Men's
$47.73
Save 36%
compared to $75.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Big
REI OUTLET
SmartwoolIntraknit Active Base Layer Bottoms - Men's
$81.73
Save 25%
compared to $110.00
4 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Big
REI OUTLET
Icebreaker200 Oasis Crewe Base Layer Top - Men's
$95.00
43 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
ExOfficioGive-N-Go 2.0 Boxer Briefs - Men's
$22.73
Save 24%
compared to $30.00
2960 reviews with an average rating of 4.5 out of 5 stars
Size Type:
Regular
REI OUTLET
REI Co-opMerino 185 Base Layer Bottoms - Men's Tall Sizes
$79.95
16 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Tall, Big
Arc'teryxRho LT Base Layer Bottoms - Men's
$79.73
Save 20%
compared to $100.00
11 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Big
REI OUTLET
Terramar2.0 Thermolator Base Layer Pants - Men's
$32.73
Save 27%
compared to $45.00
1 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big
REI OUTLET
StanceSea Green Wholester Boxer Briefs - Men's
$24.73
Save 29%
compared to $35.00
0 reviews
Size Type:
Regular
REI OUTLET
TerramarC-Suite Mammoth Sherpa Fleece Mid-Layer Pants - Men's
$56.73
Save 29%
compared to $80.00
2 reviews with an average rating of 3.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
StanceIn Paradise Boxer Briefs - Men's
$18.73
Save 30%
compared to $27.00
1 reviews with an average rating of 2.0 out of 5 stars
Size Type:
Regular
REI OUTLET
StanceArgile Boxer Briefs - Men's
$19.73
Save 34%
compared to $30.00
0 reviews
Size Type:
Regular
REI OUTLET
SaxxUltra Super Soft Boxer Briefs - Men's
$25.73
Save 24%
compared to $34.00
4 reviews with an average rating of 3.8 out of 5 stars
Size Type:
Regular
REI OUTLET
StanceNavy Mash Wholester Boxer Briefs - Men's
$26.73
Save 23%
compared to $35.00
0 reviews
Size Type:
Regular
REI OUTLET
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Men's
$99.73
Save 26%
compared to $135.00
42 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Big
REI OUTLET
StanceRome Boxer Briefs - Men's
$16.73
Save 33%
compared to $25.00
0 reviews
Size Type:
Regular
REI OUTLET
StanceCurren Wholester Boxer Briefs - Men's
$26.73
Save 23%
compared to $35.00
0 reviews
Size Type:
Regular
REI OUTLET
Top Rated
Icebreaker150 Anatomica Crewe Base Layer Top - Men's
$75.00
17 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
StanceCurren Boxer Briefs - Men's
$22.73
Save 24%
compared to $30.00
0 reviews
Size Type:
Regular
REI OUTLET
StanceGeo Comb Wholester Boxer Briefs - Men's
$24.73
Save 29%
compared to $35.00
0 reviews
Size Type:
Regular
REI OUTLET
StanceSlipping Wholester Boxer Briefs - Men's
$24.73
Save 29%
compared to $35.00
0 reviews
Size Type:
Regular
REI OUTLET

61–90 of 142 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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