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Gray Men's Underwear

(47 products)

Products (47)

Sort: Best Match

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
Sale Ends May 25
Top Rated
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
$74.99
Save 25%
compared to $100.00
106 reviews with an average rating of 4.6 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
213 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
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
Sale Ends May 25
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
$97.49
Save 25%
compared to $130.00
63 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
REI Co-opLightweight Crew Base Layer Top - Men's
$26.19
Save 25%
compared to $34.95
32 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
SmartwoolClassic Thermal Merino 3/4 Base Layer Bottoms - Men's
$78.73
Save 25%
compared to $105.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Sale Ends May 25
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
$33.69
Save 25%
compared to $44.95
42 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Sale Ends May 25
SmartwoolClassic All-Season Merino T-Shirt - Men's
$71.19
Save 25%
compared to $95.00
111 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Sale Ends May 25
REI Co-opLightweight Half-Zip Base Layer Top - Men's
$37.39
Save 25%
compared to $49.95
24 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
SmartwoolClassic Thermal Merino Base Layer Hoodie - Men's
$108.73
Save 25%
compared to $145.00
3 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Men's
$70.93
Save 20%
compared to $89.00
93 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends May 25
Top Rated
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's
$78.69
Save 25%
compared to $105.00
11 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men's
$78.93
Save 20%
compared to $99.00
80 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends May 25
Top Rated
REI Co-opLightweight Base Layer Bottoms - Men's
$33.69
Save 25%
compared to $44.95
29 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Sale Ends May 25
Top Rated
REI Co-opMidweight Base Layer Half-Zip Top - Men's
$44.89
Save 25%
compared to $59.95
194 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
SmartwoolIntraknit Thermal Merino Base Layer Quarter-Zip Top - Men's
$59.83 - $104.99
Save 25% - 57%
compared to $140.00
21 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends May 25
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$89.99
Save 25%
compared to $120.00
231 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends May 25
Top Rated
IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men's
$89.99
Save 25%
compared to $120.00
87 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolClassic Thermal Merino Colorblock Crew Base Layer Top - Men's
$96.73
Save 25%
compared to $130.00
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Sale Ends May 25
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Men's
$101.19
Save 25%
compared to $135.00
51 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolIntraknit Thermal Merino Base Layer Hoodie - Men's
$134.73
Save 25%
compared to $180.00
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
StanceIs It Paisley Wholester Boxer Briefs - Men's
$24.73
Save 29%
compared to $35.00
0 reviews
Size Type:
Regular
REI OUTLET
Sale Ends May 25
Top Rated
Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Men's
$97.49
Save 25%
compared to $130.00
36 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
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
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
PatagoniaCapilene Thermal Weight Long Underwear Crew Top - Men's
$78.93 - $99.00
12 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Sale Ends May 25
Icebreaker200 Oasis Crewe Base Layer Top - Men's
$82.49
Save 25%
compared to $110.00
49 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolIntraknit 6" Boxer Briefs - Men's
$36.73
Save 26%
compared to $50.00
7 reviews with an average rating of 3.1 out of 5 stars
Size Type:
Big
REI OUTLET
Royal RobbinsReadyDry Boxers - Men's
$19.73
Save 29%
compared to $28.00
0 reviews
Size Type:
Big
REI OUTLET
Sale Ends May 25
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men's
$93.69
Save 25%
compared to $125.00
80 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big

1–30 of 47 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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