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Men's Underwear

(154 products)

Products (154)

Sort: Best Match

Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
$89.95
137 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI Co-opMerino Boxer Briefs - Men's
$39.95
116 reviews with an average rating of 4.2 out of 5 stars
Size Type:
Regular, Big
SaxxQuest Quick-Dry Boxer Briefs - Men's
$34.00
3 reviews with an average rating of 4.7 out of 5 stars
Size Type:
Regular, Big
Top Rated
REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
$19.83 - $54.95
211 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
ExOfficioEveryday Boxers - Men's
$19.73
Save 34%
compared to $30.00
0 reviews
Size Type:
Regular, Big
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$49.83 - $125.00
1539 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolIntraknit Thermal Merino Colorblock Crew Base Layer Top - Men's
$49.83 - $130.00
12 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
$39.83 - $100.00
106 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
ExOfficioEveryday Boxer Briefs - Men's
$19.73
Save 34%
compared to $30.00
211 reviews with an average rating of 3.9 out of 5 stars
Size Type:
Regular, Big
REI OUTLET
Arc'teryxRho LT Base Layer Bottoms - Men's
$59.83 - $100.00
61 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
ExOfficioEveryday Briefs - Men's
$16.73
Save 35%
compared to $26.00
281 reviews with an average rating of 4.1 out of 5 stars
Size Type:
Regular, Big
REI OUTLET
StanceTiki Tides Boxer Briefs - Men's
$16.73
Save 33%
compared to $25.00
1 reviews with an average rating of 5.0 out of 5 stars
Size Type:
Regular
REI OUTLET
REI Co-opEveryday Boxers - Men's
$24.95
140 reviews with an average rating of 4.2 out of 5 stars
Size Type:
Regular, Big
StanceStone Boxer Briefs - Men's
$16.73
Save 33%
compared to $25.00
0 reviews
Size Type:
Regular
REI OUTLET
REI Co-opMerino Boxers - Men's
$39.95
82 reviews with an average rating of 4.3 out of 5 stars
Size Type:
Regular, Big
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Top Rated
REI Co-opMidweight Base Layer Half-Zip Top - Men's
$59.95
194 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opMidweight Base Layer Bottoms - Men's
$54.95
104 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
Top Rated
SmartwoolClassic Thermal Merino Base Layer Bottoms - Men's
$125.00
647 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
StanceBrong 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
$19.73 - $26.73
Save 27% - 43%
compared to $35.00 - $37.00
0 reviews
Size Type:
Regular
REI OUTLET
Earn 15% in total rewards

Get 5% on all REI Co-op purchases plus the 10% Co-op Member Reward you earn on eligible full-price purchases.
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Terms apply
REI Co-opMerino 185 Base Layer Bottoms - Men's
$79.95
169 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI Co-opEveryday Boxer Briefs - Men's
$24.95
163 reviews with an average rating of 4.1 out of 5 stars
Size Type:
Regular, Big
Top Rated
REI Co-opLightweight Base Layer Bottoms - Men's
$44.95
28 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's
$29.83 - $104.95
33 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
StanceCeramic 3 Boxer Briefs - Men's
$19.73
Save 34%
compared to $30.00
0 reviews
Size Type:
Regular
REI OUTLET
New arrival
StanceFlower Flora Boxer Briefs - Men's
$16.73
Save 33%
compared to $25.00
0 reviews
Size Type:
Regular
REI OUTLET
StanceBlack Tie Boxer Briefs - Men's
$19.73
Save 34%
compared to $30.00
0 reviews
Size Type:
Regular
REI OUTLET
tasc PerformanceElevation Merino Base Layer Bottoms - Men's
$46.73 - $54.73
Save 30% - 40%
compared to $79.00
44 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
$49.83 - $130.00
61 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
12 reviews with an average rating of 4.2 out of 5 stars
Size Type:
Regular
REI OUTLET