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Underwear: Deals

(320 products)

Products (320)

Sort: Best Match

SmartwoolClassic All-Season Merino Base Layer Bottoms - Women's
$69.93 - $100.00
24 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
New arrival
BrooksLuxe Pocket Sports Bra
$39.73
Save 27%
compared to $55.00
0 reviews
Bra Support:
Medium Impact
Support Style:
Compression
Fabric:
77% recycled polyester/23% spandex; cups: 58% polyurethane/42% recycled polyester
REI OUTLET
New arrival
The North FaceRefina Longline Bra
$44.73
Save 25%
compared to $60.00
0 reviews
Bra Support:
Medium Impact
Support Style:
Compression
Fabric:
267 g/m² 79% recycled polyester/21% elastane LYCRA® Adaptiv with FlashDry™
REI OUTLET
Top Rated
IcebreakerMerino 125 ZoneKnit Long-Sleeve Half-Zip Base Layer Top - Men's
$99.73
Save 26%
compared to $135.00
16 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
Icebreaker260 Tech Long-Sleeve Crewe Base Layer Top - Women's
$61.83 - $140.00
48 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Terramar3.0 Thermawool Base Layer Tights - Women's
$44.73
Save 36%
compared to $70.00
3 reviews with an average rating of 1.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
PatagoniaCapilene Midweight Zip-Neck Long Underwear Top - Men's
$63.73
Save 35%
compared to $99.00
75 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Icebreaker260 Tech Base Layer Leggings - Women's
$61.83 - $125.00
34 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Top Rated
SmartwoolClassic Thermal Merino 3/4 Base Layer Bottoms - Men's
$79.93 - $115.00
85 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
Kari TraaRose High-Waisted Base Layer Pants - Women's
$64.83 - $120.00
14 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
SmartwoolIntraknit Thermal Merino Colorblock Quarter-Zip Base Layer Top - Women's
$89.93 - $140.00
7 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
PatagoniaCapilene Thermal Weight Crewneck Base Layer Top - Men's
$73.73
Save 25%
compared to $99.00
0 reviews
Underwear Weight:
Heavyweight
Size Type:
Regular
REI OUTLET
Sale Ends Mar 23
REI Co-opMerino 185 Base Layer Top - Men's
$52.39
Save 25%
compared to $69.95
58 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
tasc PerformanceElevation Merino Base Layer Bottoms - Men's
$49.73 - $54.73
Save 30% - 37%
compared to $79.00
43 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Women's
$56.83 - $130.00
41 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Base Layer Top - Women's
$59.83 - $120.00
1 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
Icebreaker200 Sonebula Leggings - Men's
$89.73
Save 25%
compared to $120.00
5 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Big
REI OUTLET
Top Rated
Kari TraaEdith Half-Zip Base Layer Top - Women's
$81.73
Save 25%
compared to $110.00
12 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
PatagoniaCapilene Thermal Weight Boot-Length Long Underwear Bottoms - Women's
$39.83
Save 53%
compared to $85.00
7 reviews with an average rating of 3.4 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's
$49.83 - $99.00
30 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's
$96.73
Save 25%
compared to $130.00
130 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
REI Co-opMerino 185 Base Layer Bottoms - Women's Plus Sizes
$49.93
Save 37%
compared to $79.95
11 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Terramar3.0 Thermawool Crew Base Layer Top - Women's
$49.73
Save 28%
compared to $70.00
1 reviews with an average rating of 3.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
PatagoniaCapilene Thermal Weight Zip-Neck Base Layer Top - Women's
$69.73
Save 36%
compared to $109.00
17 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
REI OUTLET
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's
$63.73
Save 35%
compared to $99.00
30 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
IcebreakerMerino 200 ZoneKnit Long-Sleeve Half-Zip Base Layer Top - Men's
$119.73
Save 25%
compared to $160.00
7 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Kari TraaSmekker Long-Sleeve Base Layer Top - Women's
$89.73
Save 25%
compared to $120.00
4 reviews with an average rating of 3.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$99.93 - $150.00
208 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Kari TraaAnna Long-Sleeve Base Layer Top - Women's
$54.83
Save 50%
compared to $110.00
2 reviews with an average rating of 3.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
PatagoniaCapilene Midweight Crew Base Layer Top - Kids'
$28.73
Save 26%
compared to $39.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET

121–150 of 320 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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