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Men's Underwear

(143 products)

Products (143)

Sort: Best Match

Sale Ends May 25
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
$67.39
Save 25%
compared to $89.95
137 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Sale Ends May 25
REI Co-opMerino Boxer Briefs - Men's
$29.89
Save 25%
compared to $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
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
$39.83 - $74.99
Save 25% - 60%
compared to $100.00
106 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
SmartwoolIntraknit Thermal Merino Colorblock Crew Base Layer Top - Men's
$49.83 - $97.49
Save 25% - 61%
compared to $130.00
12 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Sale Ends May 25
Top Rated
REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
$41.19
Save 25%
compared to $54.95
211 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$49.83 - $93.69
Save 25% - 60%
compared to $125.00
1539 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends May 25
REI Co-opEveryday Boxers - Men's
$18.69
Save 25%
compared to $24.95
140 reviews with an average rating of 4.2 out of 5 stars
Size Type:
Regular, Big
Sale Ends May 25
REI Co-opMerino Boxers - Men's
$29.89
Save 25%
compared to $39.95
82 reviews with an average rating of 4.3 out of 5 stars
Size Type:
Regular, Big
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 Quarter-Zip Base Layer Top - Men's
$49.83 - $97.49
Save 25% - 61%
compared to $130.00
62 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends May 25
Top Rated
SmartwoolClassic Thermal Merino Base Layer Bottoms - Men's
$93.69
Save 25%
compared to $125.00
647 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends May 25
REI Co-opMerino 185 Base Layer Bottoms - Men's
$59.89
Save 25%
compared to $79.95
169 reviews with an average rating of 4.2 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
Sale Ends May 25
Top Rated
REI Co-opLightweight Base Layer Bottoms - Men's
$33.69
Save 25%
compared to $44.95
28 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
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
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
StanceStone Boxer Briefs - Men's
$16.73
Save 33%
compared to $25.00
0 reviews
Size Type:
Regular
REI OUTLET
StanceCheck Me Out Boxer Briefs - Men's
$19.73
Save 34%
compared to $30.00
0 reviews
Size Type:
Regular
REI OUTLET
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Men's
$89.00
Add to cart to see price
93 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
StanceCeramic 3 Boxer Briefs - Men's
$19.73
Save 34%
compared to $30.00
0 reviews
Size Type:
Regular
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Men's
$89.73
Save 25%
compared to $120.00
62 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Sale Ends May 25
SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's
$74.99
Save 25%
compared to $100.00
30 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
StanceBlack Tie Boxer Briefs - Men's
$19.73
Save 34%
compared to $30.00
0 reviews
Size Type:
Regular
REI OUTLET
Lorem

Lorem

Get $130 in value

When approved for the REI Co-op Mastercard by May 25, you’ll get $30 in card rewards. Plus, you can earn a $100 REI gift card after your first non-REI purchase within 60 days from account opening. Terms apply.
Apply now
Sale Ends May 25
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
$33.69
Save 25%
compared to $44.95
41 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
StanceButter Blend Boxers - Men's
$22.73
Save 28%
compared to $32.00
6 reviews with an average rating of 3.7 out of 5 stars
Size Type:
Regular
REI OUTLET
SmartwoolIntraknit Thermal Max Merino Quarter-Zip Base Layer Top - Men's
$69.83 - $116.19
Save 25% - 54%
compared to $155.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Big
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
StanceRockford Boxer Briefs - Men's
$18.73
Save 30%
compared to $27.00
0 reviews
Size Type:
Regular
REI OUTLET
Sale Ends May 25
REI Co-opEveryday Boxer Briefs - Men's
$18.69
Save 25%
compared to $24.95
163 reviews with an average rating of 4.1 out of 5 stars
Size Type:
Regular, Big

1–30 of 143 products

Sort: Best Match

Related Expert Advice articles

Fabrics

Synthetic: moisture-wicking, quick drying, durable, but can hold on to odor
Wool: moisture-wicking, odor-resistant, cooling in warm weather, can be less durable

Styles

Bikini: less rear coverage, thinner waistband, higher-cut leg
Briefs (women's): full-cut briefs offer more coverage in front and back; hipsters offer medium front coverage and back with higher rise
Briefs (men's): close fit and good support, but less thigh coverage
Boxer brief or boy shorts: snug fit, good coverage, longer cut extends down to the upper thigh
Boxers: looser fit, added coverage can prevent chafing but prone to bunching
Thongs: lightweight and quick-drying but provide the least coverage
Sports bras: compression and support during high-output activities like hiking and running

Read full article: How to Choose Hiking Underwear

Which material is best?

Wool: highly moisture-wicking and odor-resistant
Synthetic: durable and less expensive
Silk: soft and lightweight for casual activities

Match the temp to the trek

Lightweight layers: best for moderate to cool temperatures
Midweight layers: best for cold temperatures
Heavyweight layers: best for below-freezing temperatures

Find your fit

Must be close to skin to efficiently wick sweat; should fit comfortably snug
Base layer is for moisture control; your mid layer is for warmth

Read full article: How to Choose Base Layers

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