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Polyester Base Layers

(120 products)

Products (120)

Sort: Best Match

REI Co-opMidweight Long-Sleeve Base Layer Top - Women's
$19.83 - $54.95
269 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI Co-opMidweight Base Layer Tights - Women's
$19.83 - $54.95
100 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus, Petite
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Men's
$39.83 - $89.00
80 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
$26.83 - $54.95
164 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
REI Co-opMidweight Base Layer Half-Zip Top - Women's
$59.95
155 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI Co-opMidweight Base Layer Bottoms - Men's
$54.95
79 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opMidweight Base Layer Bottoms - Kids'
$16.83 - $34.95
8 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
$39.95
12 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opMidweight Base Layer Half-Zip Top - Men's
$59.95
154 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women's
$39.95
25 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men's
$49.83 - $99.00
61 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
Arc'teryxRho LT Zip-Neck Base Layer Top - Men's
$120.00
92 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
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
Underwear Weight:
Midweight
Size Type:
Regular
Arc'teryxRho Base Layer Bottoms - Women's
$24.83 - $100.00
16 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI Co-opLightweight Base Layer Bottoms - Men's
$39.95
14 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Top Rated
Arc'teryxRho LT Crew Neck Base Layer Top - Men's
$100.00
30 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
REI Co-opMidweight Crew Base Layer Top - Toddlers'
$24.95
15 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Kari TraaFryd Base Layer Pants - Women's
$29.83 - $65.00
15 reviews with an average rating of 3.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
REI Co-opMidweight Base Layer Bottoms - Toddlers'
$24.95
8 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI Co-opLightweight Crew Base Layer Top - Men's
$29.95
19 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opLightweight Base Layer Crew Top - Kids'
$29.95
13 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
REI Co-opLightweight Base Layer Bottoms - Kids'
$29.95
10 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
PatagoniaCapilene Thermal Weight Zip-Neck Top - Men's
$109.00
21 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Terramar2.0 Cloud Nine Half-Zip Base Layer Top - Women's
$34.73
Save 30%
compared to $50.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
REI Co-opLightweight Half-Zip Base Layer Top - Men's
$44.95
7 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opLightweight Crew Base Layer Top - Women's
$29.95
14 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI Co-opLightweight Half-Zip Base Layer Top - Women's
$44.95
4 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
REI Co-opLightweight Crew Base Layer Top - Infants'/Toddlers'
$19.95
13 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
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
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Free CountryForce Grid Fleece Base Layer Top - Women's
$34.73
Save 36%
compared to $55.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI OUTLET

1–30 of 120 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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