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Base Layer

(430 products)

Products (430)

Sort: Best Match

Top Rated
REI Co-opLightweight Base Layer Bottoms - Men's
$39.95
8 reviews with an average rating of 4.8 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
REI Co-opMerino 185 Base Layer Bottoms - Men's
$39.83 - $79.95
127 reviews with an average rating of 4.3 out of 5 stars
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
$39.95
5 reviews with an average rating of 4.4 out of 5 stars
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
$55.93 - $79.95
170 reviews with an average rating of 4.5 out of 5 stars
Top Rated
REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
$54.95
151 reviews with an average rating of 4.5 out of 5 stars
SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's
$66.93 - $90.00
18 reviews with an average rating of 4.1 out of 5 stars
tasc PerformanceElevation Merino Base Layer Bottoms - Men's
$49.73
Save 37%
compared to $79.00
29 reviews with an average rating of 3.8 out of 5 stars
REI OUTLET
Top Rated
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
$66.93 - $90.00
57 reviews with an average rating of 4.6 out of 5 stars
REI Co-opMidweight Long-Sleeve Base Layer Top - Women's
$54.95
240 reviews with an average rating of 4.2 out of 5 stars
Top Rated
REI Co-opMidweight Base Layer Half-Zip Top - Men's
$59.95
133 reviews with an average rating of 4.6 out of 5 stars
REI Co-opLightweight Crew Base Layer Top - Men's
$29.95
7 reviews with an average rating of 4.4 out of 5 stars
Top Rated
SmartwoolClassic Thermal Merino Base Layer Bottoms - Men's
$115.00
615 reviews with an average rating of 4.7 out of 5 stars
REI Co-opMidweight Base Layer Tights - Women's
$54.95
90 reviews with an average rating of 4.1 out of 5 stars
REI Co-opLightweight Half-Zip Base Layer Top - Men's
$44.95
3 reviews with an average rating of 4.7 out of 5 stars
Top Rated
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women's
$39.95
11 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
38 reviews with an average rating of 4.2 out of 5 stars
REI OUTLET
SaxxRoast Master Midweight Base Layer Bottoms - Men's
$52.73
Save 29%
compared to $75.00
0 reviews
REI OUTLET
REI Co-opHeavyweight Merino Base Layer Bottoms - Men's
$49.83
Save 50%
compared to $99.95
7 reviews with an average rating of 4.4 out of 5 stars
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
Icebreaker125 ZoneKnit Merino Thermal Leggings - Men's
$93.73
Save 25%
compared to $125.00
0 reviews
REI OUTLET
REI Co-opMidweight Base Layer Half-Zip Top - Women's
$29.83 - $59.95
134 reviews with an average rating of 4.4 out of 5 stars
Top Rated
REI Co-opMidweight Base Layer Crew Top - Kids'
$34.95
5 reviews with an average rating of 5.0 out of 5 stars
Top Rated
REI Co-opLightweight Base Layer Tights - Women's
$39.95
7 reviews with an average rating of 4.6 out of 5 stars
Top Rated
Icebreaker260 Merino Tech Thermal Leggings with Fly - Men's
$125.00
52 reviews with an average rating of 4.6 out of 5 stars
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
SaxxRoast Master Midweight Long-Sleeve Crew Base Layer Top - Men's
$52.73
Save 29%
compared to $75.00
0 reviews
REI OUTLET
SmartwoolClassic All-Season Merino T-Shirt - Men's
$80.00
56 reviews with an average rating of 4.1 out of 5 stars
REI Co-opLightweight Half-Zip Base Layer Top - Women's
$44.95
1 reviews with an average rating of 5.0 out of 5 stars
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's
$55.93 - $79.95
196 reviews with an average rating of 4.4 out of 5 stars

1–30 of 430 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