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Men's Underwear: Deals

(79 products)

Products (79)

Sort: Best Match

REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's
$49.83 - $99.95
44 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
SaxxVolt Breathable Mesh Boxer Briefs - Men's
$26.73
Save 23%
compared to $35.00
10 reviews with an average rating of 4.4 out of 5 stars
Size Type:
Regular
REI OUTLET
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's
$49.83 - $104.95
27 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
$44.83 - $89.95
129 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
$26.83 - $54.95
207 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
Top Rated
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
$53.83 - $100.00
104 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
REI Co-opMidweight Base Layer Half-Zip Top - Men's
$29.83 - $59.95
190 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
$68.83 - $125.00
1538 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
tasc PerformanceElevation Merino Base Layer Bottoms - Men's
$49.73 - $54.73
Save 30% - 37%
compared to $79.00
43 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
$71.83 - $130.00
57 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$77.83 - $150.00
208 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends Apr 13
SmartwoolIntraknit 6" Boxer Briefs - Men's
$33.73
Save 32%
compared to $50.00
7 reviews with an average rating of 3.1 out of 5 stars
Size Type:
Regular, Big
REI OUTLET
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Men's
$43.83 - $89.00
92 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
tasc PerformanceElevation Merino T-Shirt - Men's
$34.73 - $54.73
Save 30% - 56%
compared to $79.00
53 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
Royal RobbinsReadyDry Boxers - Men's
$19.73
Save 29%
compared to $28.00
0 reviews
Size Type:
Big
REI OUTLET
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
Arc'teryxRho Merino Wool Crew Neck Base Layer Top - Men's
$90.93
Save 24%
compared to $120.00
45 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
Arc'teryxRho LT Zip-Neck Base Layer Top - Men's
$96.93 - $120.00
86 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$84.73
Save 26%
compared to $115.00
317 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino 3/4 Base Layer Bottoms - Men's
$62.83 - $115.00
86 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Arc'teryxRho LT Base Layer Bottoms - Men's
$75.93 - $100.00
50 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
SmartwoolIntraknit Thermal Max Merino Quarter-Zip Base Layer Top - Men's
$99.93 - $155.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Big
Arc'teryxRho SV Zip-Neck Base Layer Top - Men's
$112.93 - $140.00
14 reviews with an average rating of 3.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
SmartwoolIntraknit Thermal Merino Colorblock Crew Base Layer Top - Men's
$77.83 - $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
$66.73
Save 25%
compared to $90.00
104 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
SmartwoolIntraknit Thermal Merino Base Layer Quarter-Zip Top - Men's
$83.83 - $140.00
20 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
StanceCompression Nylon Boxer Briefs - Men's
$26.73
Save 31%
compared to $39.00
2 reviews with an average rating of 5.0 out of 5 stars
Size Type:
Regular
REI OUTLET
PatagoniaCapilene Thermal Weight Zip-Neck Base Layer Top - Men's
$69.73
Save 36%
compared to $109.00
25 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
REI OUTLET
Mountain HardwearUp First Tech Fleece Base Layer Bottoms - Men's
$74.73
Save 25%
compared to $100.00
4 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
New arrival
SmartwoolClassic Thermal Merino Colorblock Crew Base Layer Top - Men's
$96.73
Save 25%
compared to $130.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET

1–30 of 79 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

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