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Base Layers

(324 products)

Products (324)

Sort: Best Match

Top Rated
REI Co-opMidweight Base Layer Bottoms - Toddlers'
$17.93
Save 28%
compared to $24.95
9 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
Arc'teryxRho LT Crew Neck Base Layer Top - Men's
$100.00
44 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI Co-opMerino 185 Base Layer Top - Women's Plus Sizes
$29.83
Save 57%
compared to $69.95
27 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
REI Co-opMerino 185 Base Layer Top - Men's
$69.95
60 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men's
$99.00
78 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
REI Co-opMerino 185 Base Layer Bottoms - Women's Plus Sizes
$39.83
Save 50%
compared to $79.95
11 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Kari TraaKlara High-Waisted Base Layer Pants - Women's
$62.73 - $66.73
Save 25% - 30%
compared to $90.00
14 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
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:
Big, Regular
REI OUTLET
SENIQWool Sculpt Merino Mock-Neck Long-Sleeve Base Layer Shirt - Women's
$99.93 - $128.00
2 reviews with an average rating of 3.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
Top Rated
REI Co-opMidweight Base Layer Crew Top - Toddlers'
$17.93
Save 28%
compared to $24.95
16 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's
$105.00
10 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
HalfdaysJohnson Base Layer Top - Women's
$46.83
Save 50%
compared to $95.00
137 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Ultralightweight
Size Type:
Regular
SENIQWool Sculpt Merino Base Layer Leggings - Women's
$63.83 - $128.00
0 reviews
Underwear Weight:
Heavyweight
Size Type:
Regular
REI Co-opLightweight Half-Zip Base Layer Top - Men's
$49.95
23 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$51.83 - $120.00
222 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
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
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
Top Rated
HalfdaysHallie Midweight Merino Base Layer Leggings - Women's
$64.83 - $130.00
30 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
SmartwoolClassic Thermal Merino 3/4 Base Layer Bottoms - Men's
$62.83 - $115.00
86 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
HalfdaysFay Midweight Merino Base Layer Top - Women's
$64.83 - $130.00
38 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Kari TraaSmekker Half-Zip Base Layer Top - Women's
$140.00
21 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
SmartwoolIntraknit AS Merino Base Layer Bottoms - Women's
$125.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's
$49.83 - $99.00
30 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Kari TraaAnna High-Waist Base Layer Pants - Women's
$110.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Arc'teryxRho Base Layer Bottoms - Women's
$100.00
38 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Arc'teryxRho LT Base Layer Bottoms - Men's
$100.00
50 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men's
$61.83 - $125.00
80 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Top Rated
Arc'teryxRho LT Base Layer Hoody - Men's
$120.00
97 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes
$39.83
Save 55%
compared to $89.95
19 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus

61–90 of 324 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