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Sun-Protective Fabric Underwear

(84 products)

Products (84)

Sort: Best Match

Top Rated
REI Co-opMerino Midweight Base Layer Crew Top - Kids'
$49.95
29 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Women's
$99.95
32 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
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-opHeavyweight Merino Base Layer Half-Zip Top - Men's
$104.95
17 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
IcebreakerMerino 200 Oasis Thermal Leggings - Women's
$105.00
79 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
Icebreaker260 Tech Long-Sleeve Crewe Base Layer Top - Women's
$125.00
42 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Top Rated
REI Co-opMidweight Base Layer Crew Top - Toddlers'
$24.95
15 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
REI Co-opLightweight Half-Zip Base Layer Top - Men's
$44.95
15 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's Tall Sizes
$89.95
13 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Tall
Top Rated
Icebreaker200 Sonebula Leggings - Men's
$89.73
Save 25%
compared to $120.00
Members use code OUTGIFT for an extra 20% off at REI Outlet, today only.
5 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Big
REI OUTLET
KUHLReactiv Lite Grid Long-Sleeve Crew Base Layer Top - Men's
$109.00
8 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
New arrival
Terramar2.0 Thermolator Base Layer Pants - Men's
$32.73
Save 27%
compared to $45.00
Members use code OUTGIFT for an extra 20% off at REI Outlet, today only.
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
REI Co-opMerino 185 Base Layer Bottoms - Women's Plus Sizes
$79.95
9 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
REI Co-opMerino 185 Base Layer Top - Women's
$69.95
56 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
REI Co-opLightweight Crew Base Layer Top - Men's
$19.93 - $29.95
23 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Terramar3.0 Thermawool Crew Base Layer Top - Women's
$49.73
Save 28%
compared to $70.00
Members use code OUTGIFT for an extra 20% off at REI Outlet, today only.
1 reviews with an average rating of 3.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
New arrival
Terramar2.0 Thermolator Crew Base Layer Top - Kids'
$24.73
Save 29%
compared to $35.00
Members use code OUTGIFT for an extra 20% off at REI Outlet, today only.
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Icebreaker260 Tech Base Layer Leggings - Women's
$125.00
27 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Terramar2.0 Cloud Nine Half-Zip Base Layer Top - Women's
$34.73
Save 30%
compared to $50.00
Members use code OUTGIFT for an extra 20% off at REI Outlet, today only.
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
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
Top Rated
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women's
$104.95
26 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
KUHLReactiv Lite Grid Quarter-Zip Base Layer Top - Men's
$119.00
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
New arrival
Terramar3.0 Altitude Turtleneck Base Layer Top - Women's
$19.73
Save 34%
compared to $30.00
Members use code OUTGIFT for an extra 20% off at REI Outlet, today only.
1 reviews with an average rating of 3.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Icebreaker200 Oasis Crewe Base Layer Top - Men's
$95.00
39 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women's
$27.93 - $39.95
28 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's Plus Sizes
$79.95
29 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Top Rated
REI Co-opLightweight Half-Zip Base Layer Top - Women's
$44.95
12 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
KUHLReactiv Lite Grid Base Layer Bottoms - Men's
$99.00
5 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
REI Co-opLightweight Crew Base Layer Top - Women's
$29.95
21 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes
$89.95
18 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus

31–60 of 84 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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