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Men's Underwear: Deals

(122 products)

Products (122)

Sort: Best Match

Top Rated
Arc'teryxRho Heavyweight Base Layer Bottoms - Men's
$84.83
Save 29%
compared to $120.00
62 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
SaxxRoast Master Midweight Base Layer Bottoms - Men's
$52.73
Save 29%
compared to $75.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Icebreaker200 Sonebula Leggings - Men's
$89.73
Save 25%
compared to $120.00
4 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
tasc PerformanceElevation Merino T-Shirt - Men's
$49.73
Save 37%
compared to $79.00
38 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$85.93 - $115.00
1505 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Icebreaker125 ZoneKnit Merino Thermal Leggings - Men's
$93.73
Save 25%
compared to $125.00
0 reviews
Underwear Weight:
Ultralightweight
Size Type:
Regular, Big
REI OUTLET
Arc'teryxRho LT Base Layer Bottoms - Men's
$70.83 - $100.00
46 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
$62.93 - $89.95
101 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
Arc'teryxRho Insulated 3/4 Base Layer Bottoms - Men's
$159.73
Save 20%
compared to $200.00
12 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
REI OUTLET
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's
$49.83 - $99.95
21 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
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
Underwear Weight:
Lightweight
Size Type:
Regular, Big
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's
$70.93 - $95.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
Arc'teryxRho Heavyweight Base Layer Bottoms - Men's
$96.73
Save 19%
compared to $120.00
47 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
REI OUTLET
TerramarC-Suite Mammoth Sherpa Fleece Mid-Layer Pants - Men's
$56.73
Save 29%
compared to $80.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Arc'teryxRho LT Base Layer Bottoms - Men's
$79.73
Save 20%
compared to $100.00
11 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$85.73
Save 25%
compared to $115.00
273 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Men's
$84.73
Save 26%
compared to $115.00
4 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
SmartwoolClassic All Season Merino Long-Sleeve Base Layer Top - Men's
$66.73
Save 25%
compared to $90.00
56 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Icebreaker200 ZoneKnit Merino Thermal Base Layer Leggings - Men's
$109.73
Save 26%
compared to $150.00
6 reviews with an average rating of 4.2 out of 5 stars
Size Type:
Regular, Big
REI OUTLET
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's
$49.83 - $104.95
14 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
Mountain HardwearMountain Stretch Base Layer Tights - Men's
$55.73
Save 25%
compared to $75.00
10 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Big
REI OUTLET
REI Co-opMerino 185 Base Layer Top - Men's
$48.93 - $69.95
52 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
Arc'teryxRho Merino Wool Crew Neck Base Layer Top - Men's
$84.83 - $120.00
27 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Big, Regular
Free CountryMicrotech Heat Base Layer Bottoms - Men's
$31.73
Save 29%
compared to $45.00
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
IcebreakerMerino 260 Tech Long Sleeve Crewe Base Layer Top - Men's
$119.73
Save 27%
compared to $165.00
5 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
REI OUTLET
CraftActive Intensity Base Layer Pants - Men's
$36.73
Save 33%
compared to $54.95
10 reviews with an average rating of 2.7 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
Arc'teryxRho LT Zip-Neck Base Layer Top - Men's
$84.83 - $120.00
90 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
IcebreakerMerino 260 Tech Thermal Base Layer Leggings With Fly - Men's
$93.73
Save 25%
compared to $125.00
35 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
REI OUTLET
Arc'teryxRho Merino Wool Base Layer Bottoms - Men's
$96.93
Save 19%
compared to $120.00
4 reviews with an average rating of 3.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big
Top Rated
SmartwoolIntraknit Thermal Merino Base Layer Quarter-Zip Top - Men's
$69.83 - $140.00
11 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big

61–90 of 122 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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