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Men's Underwear: Deals

(74 products)

Products (74)

Sort: Best Match

tasc PerformanceElevation Merino Base Layer Bottoms - Men's
$34.73 - $54.73
Save 30% - 56%
compared to $79.00
38 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
Sale Ends Dec 29
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$64.99
Save 50%
compared to $130.00
10 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
tasc PerformanceElevation Merino T-Shirt - Men's
$54.73
Save 30%
compared to $79.00
45 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
$27.93 - $39.95
27 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Free CountryForce Grid Fleece Base Layer Bottoms - Men's
$29.73
Save 33%
compared to $45.00
9 reviews with an average rating of 3.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Sale Ends Dec 29
Top Rated
IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men's
$78.69
Save 25%
compared to $105.00
67 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SaxxQuest Boxer Briefs - Men's
$24.73
Save 27%
compared to $34.00
3 reviews with an average rating of 4.7 out of 5 stars
Size Type:
Regular
REI OUTLET
Sale Ends Dec 29
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$78.69
Save 25%
compared to $105.00
188 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends Dec 29
Top Rated
IcebreakerMerino 125 ZoneKnit Long-Sleeve Half-Zip Base Layer Top - Men's
$67.49
Save 50%
compared to $135.00
13 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
Top Rated
Free CountryForce Grid Fleece Base Layer Top - Men's
$29.73
Save 33%
compared to $45.00
12 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
Sale Ends Dec 29
Top Rated
Icebreaker260 Merino Tech Thermal Leggings with Fly - Men's
$93.69
Save 25%
compared to $125.00
66 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Top Rated
ExOfficio9" GNG Sport 2.0 Boxer Briefs - Men's
$24.73
Save 27%
compared to $34.00
531 reviews with an average rating of 4.7 out of 5 stars
Size Type:
Regular
REI OUTLET
Sale Ends Dec 29
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men's
$93.69
Save 25%
compared to $125.00
67 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Sale Ends Dec 29
IcebreakerMerino 200 ZoneKnit Long-Sleeve Half-Zip Base Layer Top - Men's
$79.99
Save 50%
compared to $160.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Free CountryCloud Knit Base Layer Bottoms - Men's
$26.73
Save 33%
compared to $40.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
SaxxVolt Breathable Mesh Boxer Briefs - Men's
$26.73
Save 23%
compared to $35.00
6 reviews with an average rating of 4.0 out of 5 stars
Size Type:
Regular, Big
REI OUTLET
Free CountryCloud Knit Crewneck Base Layer Top - Men's
$26.73
Save 33%
compared to $40.00
3 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
StanceGood Times Boxer Briefs - Men's - Package of 2
$29.73
Save 33%
compared to $45.00
0 reviews
Size Type:
Regular
REI OUTLET
Sale Ends Dec 29
Top Rated
Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Men's
$86.19
Save 25%
compared to $115.00
32 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Free FlyElevate Boxer Briefs - Men's
$28.73
Save 24%
compared to $38.00
63 reviews with an average rating of 4.0 out of 5 stars
Size Type:
Regular, Big
REI OUTLET
Sale Ends Dec 29
StanceCurren Boxer Briefs - Men's
$14.99
Save 50%
compared to $30.00
0 reviews
Size Type:
Regular
REI OUTLET
Sale Ends Dec 29
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Men's
$101.19
Save 25%
compared to $135.00
40 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
REI Co-opLightweight Crew Base Layer Top - Men's
$19.93 - $29.95
23 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
SaxxVibe Xtra Soft Comfort Boxer Briefs - Men's
$24.73
Save 27%
compared to $34.00
0 reviews
Size Type:
Regular, Big
REI OUTLET
Sale Ends Dec 29
SmartwoolIntraknit Thermal Merino Base Layer Colorblock Crew - Men's
$59.99
Save 53%
compared to $130.00
12 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Sale Ends Dec 29
StanceNavy Mash Wholester Boxer Briefs - Men's
$17.49
Save 50%
compared to $35.00
0 reviews
Size Type:
Regular
REI OUTLET
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
StanceRome Boxer Briefs - Men's
$16.73
Save 33%
compared to $25.00
0 reviews
Size Type:
Regular
REI OUTLET
StanceIn The Wild Wholester Boxer Briefs - Men's
$24.73
Save 29%
compared to $35.00
0 reviews
Size Type:
Regular
REI OUTLET
Sale Ends Dec 29
Royal RobbinsReadyDry Crew T-Shirt - Men's
$19.99
Save 50%
compared to $40.00
2 reviews with an average rating of 5.0 out of 5 stars
REI OUTLET

1–30 of 74 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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