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Men's Underwear

(142 products)

Products (142)

Sort: Best Match

REI Co-opMidweight Base Layer Bottoms - Men's
$54.95
95 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
$54.95
185 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
tasc PerformanceElevation Merino Base Layer Bottoms - Men's
$34.73 - $54.73
Save 30% - 56%
compared to $79.00
39 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
Free CountryForce Grid Fleece Base Layer Bottoms - Men's
$29.73
Save 33%
compared to $45.00
13 reviews with an average rating of 3.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
tasc PerformanceElevation Merino T-Shirt - Men's
$54.73
Save 30%
compared to $79.00
48 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Base Layer Bottoms - Men's
$125.00
632 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
$19.83 - $44.95
27 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$125.00
1503 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI Co-opMerino 185 Base Layer Bottoms - Men's
$79.95
143 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
REI Co-opHeavyweight Merino Base Layer Bottoms - Men's
$99.95
15 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
REI Co-opMerino Boxers - Men's
$39.95
74 reviews with an average rating of 4.3 out of 5 stars
Size Type:
Regular, Big
SaxxQuest Boxer Briefs - Men's
$24.73
Save 27%
compared to $34.00
3 reviews with an average rating of 4.7 out of 5 stars
Size Type:
Regular
REI OUTLET
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
$79.95
215 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
REI Co-opMidweight Base Layer Half-Zip Top - Men's
$59.95
174 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
Top Rated
Free CountryForce Grid Fleece Base Layer Top - Men's
$29.73
Save 33%
compared to $45.00
13 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$92.73
Save 28%
compared to $130.00
11 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Free CountryCloud Knit Base Layer Bottoms - 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
Free CountryCloud Knit Crewneck Base Layer Top - Men's
$26.73
Save 33%
compared to $40.00
5 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
StanceGood Times Boxer Briefs - Men's - Package of 2
$29.73
Save 33%
compared to $45.00
1 reviews with an average rating of 5.0 out of 5 stars
Size Type:
Regular
REI OUTLET
REI Co-opLightweight Base Layer Bottoms - Men's
$44.95
22 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's
$99.95
37 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
Top Rated
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
$100.00
94 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
SaxxVolt Breathable Mesh Boxer Briefs - Men's
$26.73
Save 23%
compared to $35.00
8 reviews with an average rating of 4.3 out of 5 stars
Size Type:
Regular, Big
REI OUTLET
SaxxVibe Xtra Soft Comfort Boxer Briefs - Men's
$24.73
Save 27%
compared to $34.00
0 reviews
Size Type:
Regular
REI OUTLET
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, Big
REI Co-opMerino Boxer Briefs - Men's
$39.95
113 reviews with an average rating of 4.2 out of 5 stars
Size Type:
Regular, Big
SmartwoolEveryday 6" Knit Boxer Briefs - Men's
$35.73
Save 25%
compared to $48.00
16 reviews with an average rating of 2.4 out of 5 stars
Size Type:
Regular
REI OUTLET
SaxxQuest Quick-Dry Boxer Briefs - Men's
$34.00
0 reviews
Size Type:
Regular, Big
Top Rated
IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men's
$105.00
76 reviews with an average rating of 4.6 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

1–30 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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