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Men's Base Layers

(133 products)

Products (133)

Sort: Best Match

Top Rated
REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
$26.83 - $54.95
157 reviews with an average rating of 4.5 out of 5 stars
Top Rated
REI Co-opMidweight Base Layer Half-Zip Top - Men's
$41.89 - $59.95
144 reviews with an average rating of 4.6 out of 5 stars
REI Co-opMidweight Base Layer Bottoms - Men's
$54.95
77 reviews with an average rating of 4.4 out of 5 stars
Top Rated
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
$27.89
Save 30%
compared to $39.95
9 reviews with an average rating of 4.7 out of 5 stars
tasc PerformanceElevation Merino T-Shirt - Men's
$49.73
Save 37%
compared to $79.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
38 reviews with an average rating of 4.2 out of 5 stars
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$85.73
Save 25%
compared to $115.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
276 reviews with an average rating of 4.7 out of 5 stars
REI OUTLET
Top Rated
REI Co-opLightweight Half-Zip Base Layer Top - Men's
$31.39
Save 30%
compared to $44.95
5 reviews with an average rating of 4.8 out of 5 stars
Top Rated
REI Co-opLightweight Crew Base Layer Top - Men's
$20.89
Save 30%
compared to $29.95
17 reviews with an average rating of 4.5 out of 5 stars
Top Rated
REI Co-opLightweight Base Layer Bottoms - Men's
$27.89
Save 30%
compared to $39.95
11 reviews with an average rating of 4.8 out of 5 stars
REI Co-opMerino 185 Base Layer Bottoms - Men's
$79.95
129 reviews with an average rating of 4.3 out of 5 stars
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
$79.95
180 reviews with an average rating of 4.5 out of 5 stars
Top Rated
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
$44.83 - $90.00
67 reviews with an average rating of 4.6 out of 5 stars
tasc PerformanceElevation Merino Base Layer Bottoms - Men's
$49.73
Save 37%
compared to $79.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
31 reviews with an average rating of 3.8 out of 5 stars
REI OUTLET
Top Rated
PatagoniaCapilene Midweight Base Layer Bottoms - Men's
$59.93 - $89.00
56 reviews with an average rating of 4.5 out of 5 stars
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Men's
$59.93 - $89.00
79 reviews with an average rating of 4.5 out of 5 stars
Ortovox185 Merino Rock'n'wool Long-Sleeve Base Layer Top - Men's
$54.83
Save 50%
compared to $110.00
10 reviews with an average rating of 4.2 out of 5 stars
Top Rated
Arc'teryxIonia Merino Wool Base Layer Hoody - Men's
$98.93
Save 29%
compared to $140.00
51 reviews with an average rating of 4.8 out of 5 stars
SmartwoolClassic All-Season Merino T-Shirt - Men's
$80.00
80 reviews with an average rating of 4.0 out of 5 stars
Top Rated
SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Men's
$89.73
Save 25%
compared to $120.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
19 reviews with an average rating of 4.6 out of 5 stars
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$115.00
1506 reviews with an average rating of 4.7 out of 5 stars
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$51.83 - $105.00
134 reviews with an average rating of 4.7 out of 5 stars
Top Rated
SmartwoolClassic Thermal Merino Base Layer Bottoms - Men's
$115.00
617 reviews with an average rating of 4.7 out of 5 stars
PatagoniaCapilene Thermal Weight Zip-Neck Top - Men's
$69.93 - $109.00
18 reviews with an average rating of 4.0 out of 5 stars
Top Rated
Arc'teryxRho LT Crew Neck Base Layer Top - Men's
$100.00
28 reviews with an average rating of 4.8 out of 5 stars
REI Co-opMerino 185 Base Layer Top - Men's
$69.95
54 reviews with an average rating of 4.2 out of 5 stars
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
$120.00
19 reviews with an average rating of 4.6 out of 5 stars
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
$89.95
103 reviews with an average rating of 4.6 out of 5 stars
Top Rated
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men's
$69.93 - $99.00
61 reviews with an average rating of 4.6 out of 5 stars
Top Rated
Helly HansenLIFA Merino Midweight Half-Zip Base Layer Top - Men's
$79.73
Save 27%
compared to $110.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
5 reviews with an average rating of 4.8 out of 5 stars
REI OUTLET
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
REI OUTLET

1–30 of 133 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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