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Base Layers

(329 products)

Products (329)

Sort: Best Match

REI Co-opMerino 185 Base Layer Top - Women's
$69.95
62 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
REI Co-opMerino Midweight Base Layer Bottoms - Kids'
$24.83
Save 50%
compared to $49.95
16 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
tasc PerformanceElevation Merino T-Shirt - Men's
$34.73 - $54.73
Save 30% - 56%
compared to $79.00
53 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
REI Co-opLightweight Base Layer Bottoms - Men's
$44.95
27 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's
$49.83 - $104.95
27 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
Top Rated
Kari TraaRose High-Waisted Base Layer Pants - Women's
$64.83 - $120.00
14 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
$51.83 - $120.00
179 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
SmartwoolClassic All-Season Merino T-Shirt - Women's
$95.00
103 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
SmartwoolClassic All-Season Merino T-Shirt - Men's
$95.00
104 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's Plus Sizes
$39.83
Save 50%
compared to $79.95
32 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
tasc PerformanceElevation Merino Base Layer Bottoms - Men's
$49.73 - $54.73
Save 30% - 37%
compared to $79.00
43 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
Top Rated
Arc'teryxRho LT Zip-Neck Base Layer Top - Men's
$120.00
110 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
REI Co-opLightweight Crew Base Layer Top - Women's
$34.95
26 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI Co-opMerino 185 Base Layer Top - Men's
$69.95
59 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
REI Co-opLightweight Crew Base Layer Top - Men's
$34.95
27 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opLightweight Half-Zip Base Layer Top - Women's
$49.95
16 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
REI Co-opLightweight Base Layer Tights - Women's
$44.95
10 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus, Petite
SmartwoolClassic All-Season Merino Base Layer Bottoms - Women's
$68.83 - $100.00
24 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's
$89.95
111 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
HalfdaysSophia Base Layer Leggings - Women's
$46.83 - $95.00
123 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Women's
$49.83 - $89.00
51 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men's
$48.83 - $99.00
75 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Kari TraaAnna Half-Zip Base Layer Top - Women's
$59.83 - $120.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
PatagoniaCapilene Midweight Base Layer Bottoms - Men's
$89.00
59 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
tasc PerformanceElevation Merino T-Shirt - Women's
$54.73
Save 30%
compared to $79.00
93 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI OUTLET
SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's
$100.00
30 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$77.83 - $150.00
208 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Kari TraaFryd Base Layer Pants - Women's
$31.83 - $60.00
18 reviews with an average rating of 3.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
PatagoniaCapilene Midweight Base Layer Bottoms - Women's
$89.00
28 reviews with an average rating of 4.2 out of 5 stars
Size Type:
Regular, Plus
Kari TraaRose Half-Zip Base Layer Top - Women's
$69.83 - $140.00
31 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular

31–60 of 329 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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