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Polyester Base Layers

(73 products)

Products (73)

Sort: Best Match

Sale Ends May 25
Top Rated
REI Co-opMidweight Base Layer Bottoms - Men's
$41.19
Save 25%
compared to $54.95
105 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
Sale Ends May 25
REI Co-opMidweight Base Layer Tights - Women's
$41.19
Save 25%
compared to $54.95
126 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus, Petite
Sale Ends May 25
Top Rated
REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
$41.19
Save 25%
compared to $54.95
213 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
Sale Ends May 25
REI Co-opMidweight Long-Sleeve Base Layer Top - Women's
$41.19
Save 25%
compared to $54.95
324 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Sale Ends May 25
Top Rated
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women's
$33.69
Save 25%
compared to $44.95
40 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Save 25% on all Smartwool clothing

Shop now
Sale Ends May 25
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
$33.69
Save 25%
compared to $44.95
42 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Sale Ends May 25
Top Rated
REI Co-opLightweight Base Layer Bottoms - Men's
$33.69
Save 25%
compared to $44.95
28 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Sale Ends May 25
Top Rated
REI Co-opLightweight Half-Zip Base Layer Top - Women's
$37.39
Save 25%
compared to $49.95
17 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Sale Ends May 25
Top Rated
REI Co-opMidweight Base Layer Half-Zip Top - Men's
$44.89
Save 25%
compared to $59.95
194 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
Sale Ends May 25
Top Rated
REI Co-opLightweight Base Layer Tights - Women's
$33.69
Save 25%
compared to $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
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
Sale Ends May 25
REI Co-opMidweight Base Layer Half-Zip Top - Women's
$44.89
Save 25%
compared to $59.95
198 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Sale Ends May 25
REI Co-opLightweight Half-Zip Base Layer Top - Men's
$37.39
Save 25%
compared to $49.95
24 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
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
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Women's
$70.93
Save 20%
compared to $89.00
52 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Arc'teryxRho Base Layer Bottoms - Women's
$59.83 - $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
$70.93
Save 20%
compared to $89.00
60 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Sale Ends May 25
Top Rated
REI Co-opLightweight Crew Base Layer Top - Women's
$26.19
Save 25%
compared to $34.95
31 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Sale Ends May 25
Top Rated
REI Co-opLightweight Crew Base Layer Top - Men's
$26.19
Save 25%
compared to $34.95
32 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
Free CountryForce Grid Fleece Base Layer Bottoms - Women's
$26.73
Save 51%
compared to $55.00
11 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Arc'teryxRho LT Base Layer Bottoms - Men's
$59.83 - $100.00
61 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
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'teryxKyanite Base Layer Crew Top - Women's
$95.73
Save 20%
compared to $120.00
3 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
REI OUTLET
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
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's
$63.73
Save 35%
compared to $99.00
31 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Arc'teryxRho Base Layer Bottoms - Women's
$73.73
Save 26%
compared to $100.00
15 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Lorem

Lorem

Get $130 in value

When approved for the REI Co-op Mastercard by May 25, you’ll get $30 in card rewards. Plus, you can earn a $100 REI gift card after your first non-REI purchase within 60 days from account opening. Terms apply.
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Top Rated
Arc'teryxRho LT Zip-Neck Base Layer Top - Men's
$120.00
111 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Men's
$70.93
Save 20%
compared to $89.00
93 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
PatagoniaCapilene Thermal Weight Long-Underwear Bottoms - Men's
$78.93
Save 20%
compared to $99.00
16 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Top Rated
Arc'teryxRho Zip-Neck Base Layer Top - Women's
$120.00
53 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus

1–30 of 73 products

Sort: Best Match

Related Expert Advice articles

Which material is best?

Wool: highly moisture-wicking and odor-resistant
Synthetic: durable and less expensive
Silk: soft and lightweight for casual activities

Match the temp to the trek

Lightweight layers: best for moderate to cool temperatures
Midweight layers: best for cold temperatures
Heavyweight layers: best for below-freezing temperatures

Find your fit

Must be close to skin to efficiently wick sweat; should fit comfortably snug
Base layer is for moisture control; your mid layer is for warmth

Read full article: How to Choose Base Layers

Fabrics

Synthetic: moisture-wicking, quick drying, durable, but can hold on to odor
Wool: moisture-wicking, odor-resistant, cooling in warm weather, can be less durable

Styles

Bikini: less rear coverage, thinner waistband, higher-cut leg
Briefs (women's): full-cut briefs offer more coverage in front and back; hipsters offer medium front coverage and back with higher rise
Briefs (men's): close fit and good support, but less thigh coverage
Boxer brief or boy shorts: snug fit, good coverage, longer cut extends down to the upper thigh
Boxers: looser fit, added coverage can prevent chafing but prone to bunching
Thongs: lightweight and quick-drying but provide the least coverage
Sports bras: compression and support during high-output activities like hiking and running

Read full article: How to Choose Hiking Underwear

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