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Sun-Protective Fabric Base Layer Bottoms

(30 products)

Products (30)

Sort: Best Match

Top Rated
REI Co-opLightweight Base Layer Bottoms - Men's
$39.95
8 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
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
REI Co-opMerino 185 Base Layer Bottoms - Men's
$23.83 - $79.95
127 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI Co-opMidweight Base Layer Bottoms - Men's
$54.95
77 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
REI Co-opMidweight Base Layer Tights - Women's
$54.95
91 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus, Petite
REI Co-opMerino 185 Base Layer Bottoms - Women's
$79.95
104 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI Co-opLightweight Base Layer Tights - Women's Plus Sizes
$9.83
Save 75%
compared to $39.95
12 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Top Rated
REI Co-opHeavyweight Merino Base Layer Bottoms - Women's
$29.83 - $69.93
Save 30% - 70%
compared to $99.95
18 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Plus
Icebreaker200 Sonebula Leggings - Men's
$89.73
Save 25%
compared to $120.00
4 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
REI Co-opMidweight Base Layer Bottoms - Kids'
$34.95
8 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
REI Co-opMidweight Base Layer Bottoms - Toddlers'
$24.95
7 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
REI Co-opLightweight Base Layer Bottoms - Kids'
$29.95
9 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
REI Co-opLightweight Base Layer Bottoms - Infants'/Toddlers'
$19.95
8 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI Co-opHeavyweight Merino Base Layer Bottoms - Men's
$29.83 - $49.83
Save 50% - 70%
compared to $99.95
7 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Big, Tall
Terramar2.0 Cloud Nine Midweight Base Layer Capri Pants - Women's
$28.73
Save 28%
compared to $40.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
REI Co-opMerino 185 Base Layer Bottoms - Women's Plus Sizes
$79.95
8 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
TerramarC-Suite Mammoth Sherpa Fleece Mid-Layer Pants - Men's
$56.73
Save 29%
compared to $80.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
Icebreaker260 Merino Tech Thermal Leggings with Fly - Men's
$125.00
52 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Top Rated
IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men's
$105.00
53 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
REI Co-opMerino Midweight Base Layer Bottoms - Kids'
$49.95
15 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
IcebreakerMerino 200 Oasis Thermal Leggings - Women's
$105.00
67 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
TerramarC-Suite Mammoth Sherpa Fleece Mid-Layer Joggers - Women's
$56.73
Save 29%
compared to $80.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
REI Co-opMerino 185 Base Layer Bottoms - Men's Tall Sizes
$79.95
13 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Tall, Big
Terramar3.0 Thermawool Base Layer Tights - Women's
$52.73
Save 24%
compared to $70.00
2 reviews with an average rating of 1.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Icebreaker200 Oasis Sonebula Base Layer Leggings - Women's
$89.73
Save 25%
compared to $120.00
1 reviews with an average rating of 3.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
TerramarC-Suite Fusion Thermal Pants - Women's
$46.73
Save 28%
compared to $65.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Icebreaker200 Oasis 3/4 Base Layer Bottoms - Men's
$95.00
10 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
IcebreakerMerino 200 Sonebula Thermal Base Layer Leggings - Women's
$120.00
10 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
New arrival
KUHLReactiv Lite Grid Base Layer Bottoms - Men's
$99.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
New arrival
KUHLReactiv Lite Grid Base Layer Bottoms - Women's
$99.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular

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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