loaded 191 results

Hiking Underwear Mens

(191 products)

Products (191)

Sort: Best Match

StanceBaron Boxer Briefs - Men's
$17.73
Save 29%
compared to $25.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
0 reviews
REI OUTLET
SaxxDropTemp Cooling Mesh Boxer Briefs - Men's
$26.73
Save 29%
compared to $38.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
41 reviews with an average rating of 3.8 out of 5 stars
REI OUTLET
Top Rated
REI Co-opLightweight Crew Base Layer Top - Men's
$29.95
10 reviews with an average rating of 4.6 out of 5 stars
Free FlyElevate Boxer Briefs - Men's
$28.73
Save 24%
compared to $38.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
52 reviews with an average rating of 4.0 out of 5 stars
REI OUTLET
Top Rated
Arc'teryxRho LT Crew Neck Base Layer Top - Men's
$59.83 - $100.00
27 reviews with an average rating of 4.8 out of 5 stars
SaxxDropTemp Cooling Mesh Boxer Briefs - Men's
$38.00
41 reviews with an average rating of 3.8 out of 5 stars
REI Co-opEveryday Briefs - Men's
$19.95
95 reviews with an average rating of 3.6 out of 5 stars
StanceTrail Bound Boxer Briefs - Men's
$19.73
Save 34%
compared to $30.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
1 reviews with an average rating of 5.0 out of 5 stars
REI OUTLET
Royal RobbinsReadyDry Briefs - Men's
$14.73
Save 33%
compared to $22.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
0 reviews
REI OUTLET
StanceButter Blend Boxers - Men's
$22.73
Save 24%
compared to $30.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
1 reviews with an average rating of 5.0 out of 5 stars
REI OUTLET
SaxxVibe Super Soft Boxer Briefs - Men's
$25.73
Save 24%
compared to $34.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
26 reviews with an average rating of 4.0 out of 5 stars
REI OUTLET
SaxxUltra Super Soft Boxer Briefs - Men's
$25.73
Save 24%
compared to $34.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
3 reviews with an average rating of 4.7 out of 5 stars
REI OUTLET
Top Rated
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
$66.93 - $90.00
64 reviews with an average rating of 4.6 out of 5 stars
SmartwoolClassic All-Season Merino T-Shirt - Men's
$59.93 - $80.00
69 reviews with an average rating of 4.2 out of 5 stars
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
$55.93 - $79.95
172 reviews with an average rating of 4.5 out of 5 stars
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's
$70.93 - $95.00
3 reviews with an average rating of 4.7 out of 5 stars
Top Rated
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
$39.95
7 reviews with an average rating of 4.6 out of 5 stars
REI Co-opMerino 185 Base Layer Bottoms - Men's
$23.83 - $79.95
128 reviews with an average rating of 4.3 out of 5 stars
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
$62.93 - $89.95
102 reviews with an average rating of 4.6 out of 5 stars
SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's
$90.00
18 reviews with an average rating of 4.1 out of 5 stars
REI Co-opMidweight Base Layer Bottoms - Men's
$54.95
77 reviews with an average rating of 4.4 out of 5 stars
Top Rated
SmartwoolClassic Thermal Merino 3/4 Base Layer Bottoms - Men's
$105.00
84 reviews with an average rating of 4.7 out of 5 stars
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$105.00
132 reviews with an average rating of 4.7 out of 5 stars
Top Rated
Arc'teryxIonia Merino Wool Base Layer Hoody - Men's
$140.00
49 reviews with an average rating of 4.9 out of 5 stars
Arc'teryxRho LT Base Layer Bottoms - Men's
$49.83 - $100.00
46 reviews with an average rating of 4.4 out of 5 stars
Arms of Andes160 Ultralight Alpaca Wool Base Layer Leggings - Men's
$85.00
2 reviews with an average rating of 5.0 out of 5 stars
Arms of Andes160 Ultralight Alpaca Wool Long-Sleeve Base Layer Shirt - Men's
$85.00
10 reviews with an average rating of 3.6 out of 5 stars
Top Rated
REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
$54.95
154 reviews with an average rating of 4.5 out of 5 stars
Arms of Andes300 Lightweight Alpaca Wool Half-Zip Base Layer Top - Men's
$135.00
14 reviews with an average rating of 3.9 out of 5 stars
Top Rated
Icebreaker260 Merino Tech Thermal Leggings with Fly - Men's
$125.00
52 reviews with an average rating of 4.6 out of 5 stars

1–30 of 191 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