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Polyester Base Layers

(94 products)

Products (94)

Sort: Best Match

Top Rated
REI Co-opMidweight Base Layer Bottoms - Men's
$54.95
104 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
REI Co-opMidweight Long-Sleeve Base Layer Top - Women's
$54.95
324 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
$26.83 - $54.95
209 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
$44.95
37 reviews with an average rating of 4.5 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
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-opMidweight Base Layer Tights - Women's
$54.95
126 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus, Petite
Top Rated
REI Co-opMidweight Base Layer Half-Zip Top - Men's
$29.83 - $59.95
192 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opMidweight Base Layer Bottoms - Kids'
$25.93
Save 25%
compared to $34.95
14 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI Co-opMidweight Base Layer Half-Zip Top - Women's
$59.95
195 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
REI Co-opMidweight Base Layer Crew Top - Kids'
$25.93
Save 25%
compared to $34.95
8 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
REI Co-opLightweight Crew Base Layer Top - Women's
$34.95
28 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
11 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus, Petite
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 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
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-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
Arc'teryxRho LT Zip-Neck Base Layer Top - Men's
$96.93 - $120.00
87 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
Arc'teryxRho Zip-Neck Base Layer Top - Women's
$90.93 - $120.00
52 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Arc'teryxRho SV Zip-Neck Base Layer Top - Men's
$112.93 - $140.00
14 reviews with an average rating of 3.6 out of 5 stars
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
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
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
Top Rated
REI Co-opLightweight Crew Base Layer Top - Men's
$34.95
29 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
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
New arrival
The North FaceDotKnit Thermal Base Layer Set - Kids'
$51.73
Save 26%
compared to $70.00
0 reviews
Underwear Weight:
Midweight
Size Type:
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
Arc'teryxRho Base Layer Bottoms - Women's
$75.93 - $100.00
38 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
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
Top Rated
Arc'teryxRho Hoody Base Layer Top - Women's
$105.93
Save 24%
compared to $140.00
42 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus

1–30 of 94 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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