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Men's Base Layers

(132 products)

Products (132)

Sort: Best Match

REI Co-opMidweight Base Layer Bottoms - Men's
$54.95
82 reviews with an average rating of 4.4 out of 5 stars
Top Rated
REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
$54.95
171 reviews with an average rating of 4.5 out of 5 stars
Sale Ends Dec 1
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$86.19
Save 25%
compared to $115.00
1507 reviews with an average rating of 4.7 out of 5 stars
Sale Ends Dec 1
Top Rated
SmartwoolClassic Thermal Merino Base Layer Bottoms - Men's
$86.19
Save 25%
compared to $115.00
624 reviews with an average rating of 4.7 out of 5 stars
Sale Ends Dec 8
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
$55.89
Save 30%
compared to $79.95
193 reviews with an average rating of 4.5 out of 5 stars
Top Rated
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
$27.93 - $39.95
21 reviews with an average rating of 4.4 out of 5 stars
Top Rated
REI Co-opLightweight Base Layer Bottoms - Men's
$39.95
15 reviews with an average rating of 4.5 out of 5 stars
Top Rated
REI Co-opHeavyweight Merino Base Layer Bottoms - Men's
$99.95
9 reviews with an average rating of 4.6 out of 5 stars
Sale Ends Dec 8
REI Co-opMerino 185 Base Layer Bottoms - Men's
$55.89
Save 30%
compared to $79.95
132 reviews with an average rating of 4.3 out of 5 stars
Sale Ends Dec 1
Top Rated
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
$67.49
Save 25%
compared to $90.00
73 reviews with an average rating of 4.5 out of 5 stars
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's
$99.95
28 reviews with an average rating of 4.4 out of 5 stars
Top Rated
REI Co-opMidweight Base Layer Half-Zip Top - Men's
$59.95
156 reviews with an average rating of 4.6 out of 5 stars
Sale Ends Dec 8
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
$62.89
Save 30%
compared to $89.95
111 reviews with an average rating of 4.5 out of 5 stars
Sale Ends Dec 1
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
$89.99
Save 25%
compared to $120.00
31 reviews with an average rating of 4.6 out of 5 stars
Top Rated
REI Co-opLightweight Half-Zip Base Layer Top - Men's
$44.95
11 reviews with an average rating of 4.9 out of 5 stars
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's
$104.95
16 reviews with an average rating of 4.0 out of 5 stars
tasc PerformanceElevation Merino Base Layer Bottoms - Men's
$34.73 - $54.73
Save 30% - 56%
compared to $79.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
35 reviews with an average rating of 3.8 out of 5 stars
REI OUTLET
tasc PerformanceElevation Merino T-Shirt - Men's
$54.73
Save 30%
compared to $79.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
41 reviews with an average rating of 4.2 out of 5 stars
REI OUTLET
Top Rated
PatagoniaCapilene Midweight Base Layer Bottoms - Men's
$89.00
58 reviews with an average rating of 4.5 out of 5 stars
Sale Ends Dec 8
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's Tall Sizes
$55.89
Save 30%
compared to $79.95
9 reviews with an average rating of 4.9 out of 5 stars
Sale Ends Dec 8
REI Co-opMerino 185 Base Layer Bottoms - Men's Tall Sizes
$55.89
Save 30%
compared to $79.95
13 reviews with an average rating of 3.9 out of 5 stars
Top Rated
REI Co-opLightweight Crew Base Layer Top - Men's
$19.93 - $29.95
21 reviews with an average rating of 4.5 out of 5 stars
KUHLReactiv Lite Grid Long-Sleeve Crew Base Layer Top - Men's
$109.00
5 reviews with an average rating of 4.2 out of 5 stars
Sale Ends Dec 8
REI Co-opMerino 185 Base Layer Top - Men's
$48.89
Save 30%
compared to $69.95
54 reviews with an average rating of 4.2 out of 5 stars
Free CountryCloud Knit Crewneck Base Layer Top - Men's
$26.73
Save 33%
compared to $40.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
2 reviews with an average rating of 5.0 out of 5 stars
REI OUTLET
Sale Ends Dec 1
SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's
$67.49
Save 25%
compared to $90.00
20 reviews with an average rating of 4.1 out of 5 stars
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$92.73
Save 28%
compared to $130.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
9 reviews with an average rating of 4.1 out of 5 stars
REI OUTLET
Sale Ends Dec 1
SmartwoolClassic All-Season Merino T-Shirt - Men's
$59.99
Save 25%
compared to $80.00
89 reviews with an average rating of 4.0 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
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Men's
$89.00
87 reviews with an average rating of 4.5 out of 5 stars

1–30 of 132 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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