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Hiking Underwear Mens

(189 products)

Products (189)

Sort: Best Match

StanceThe Vacationeer Boxer Briefs - Men's
$19.73
Save 26%
compared to $27.00
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
Top Rated
Arc'teryxRho LT Zip-Neck Base Layer Top - Men's
$59.83 - $120.00
90 reviews with an average rating of 4.6 out of 5 stars
StancePedlz Fallin Boxer Briefs - Men's
$22.73
Save 24%
compared to $30.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
0 reviews
REI OUTLET
ZoicCarbon Liner Bike Shorts - Men's
$74.73
Save 25%
compared to $100.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
1 reviews with an average rating of 1.0 out of 5 stars
REI OUTLET
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
Top Rated
PatagoniaCapilene Midweight Base Layer Bottoms - Men's
$89.00
56 reviews with an average rating of 4.5 out of 5 stars
PatagoniaCapilene Thermal Weight Long-Underwear Bottoms - Men's
$99.00
14 reviews with an average rating of 4.0 out of 5 stars
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
Top Rated
SmartwoolClassic Thermal Merino Base Layer Bottoms - Men's
$115.00
615 reviews with an average rating of 4.7 out of 5 stars
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's
$49.83 - $99.95
22 reviews with an average rating of 4.4 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
PatagoniaCapilene Thermal Weight Long Underwear Crew Top - Men's
$99.00
10 reviews with an average rating of 4.3 out of 5 stars
StancePalmer Boxer Briefs - Men's
$18.73
Save 25%
compared to $25.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
0 reviews
REI OUTLET
ZoicLuxe Bike Liner Shorts - Men's
$51.73
Save 26%
compared to $70.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
1 reviews with an average rating of 1.0 out of 5 stars
REI OUTLET
REI Co-opEveryday Briefs - Men's
$19.95
95 reviews with an average rating of 3.6 out of 5 stars
Top Rated
Arc'teryxIonia Merino Wool Base Layer Top - Men's
$90.00
38 reviews with an average rating of 4.7 out of 5 stars
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$85.73
Save 25%
compared to $115.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
276 reviews with an average rating of 4.7 out of 5 stars
REI OUTLET
REI Co-opMerino 185 Base Layer Top - Men's
$48.93 - $69.95
53 reviews with an average rating of 4.2 out of 5 stars
StanceTakawitz Boxer Briefs - Men's
$19.73
Save 34%
compared to $30.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
2 reviews with an average rating of 5.0 out of 5 stars
REI OUTLET
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Men's
$89.00
79 reviews with an average rating of 4.5 out of 5 stars
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
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$78.73
Save 25%
compared to $105.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
64 reviews with an average rating of 4.5 out of 5 stars
REI OUTLET
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
ZoicLuxe Bib Bike Liner Shorts - Men's
$82.73
Save 31%
compared to $120.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
1 reviews with an average rating of 1.0 out of 5 stars
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
$120.00
18 reviews with an average rating of 4.6 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-opHeavyweight Merino Base Layer Bottoms - Men's
$29.83 - $49.83
Save 50% - 70%
compared to $99.95
7 reviews with an average rating of 4.4 out of 5 stars
Top Rated
Arc'teryxRho Heavyweight Base Layer Bottoms - Men's
$59.83
Save 50%
compared to $120.00
62 reviews with an average rating of 4.7 out of 5 stars
Top Rated
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men's
$99.00
61 reviews with an average rating of 4.6 out of 5 stars
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$105.00
134 reviews with an average rating of 4.7 out of 5 stars

31–60 of 189 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