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Base Layers

(331 products)

Products (331)

Sort: Best Match

REI Co-opMerino 185 Base Layer Bottoms - Men's
$79.95
164 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
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-opLightweight Long-Sleeve Crew Base Layer Top - Men's
$44.95
40 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Top Rated
Arc'teryxRho Merino Wool Crew Neck Base Layer Top - Men's
$120.00
Add to cart to see price
45 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Men's
$43.83 - $89.00
92 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
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
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
SmartwoolClassic All-Season Merino T-Shirt - Women's
$95.00
106 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
tasc PerformanceElevation Merino Base Layer Bottoms - Women's
$54.73
Save 30%
compared to $79.00
67 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
$79.95
224 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
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
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
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's Plus Sizes
$39.83
Save 50%
compared to $79.95
34 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
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
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
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
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
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Women's
$49.83 - $89.00
52 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
REI Co-opLightweight Crew Base Layer Top - Men's
$34.95
28 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
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
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
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
SmartwoolClassic All-Season Merino T-Shirt - Men's
$95.00
105 reviews with an average rating of 3.9 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
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
SmartwoolClassic Thermal Merino Colorblock Crew Base Layer Top - Women's
$77.83
Save 40%
compared to $130.00
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
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
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
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
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

31–60 of 331 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