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Underwear

(512 products)

Products (512)

Sort: Best Match

SmartwoolMerino Print Boxer Briefs - Men's
$34.73
Save 27%
compared to $48.00
5 reviews with an average rating of 3.2 out of 5 stars
REI OUTLET
New arrival
StanceTwo Tone Boxer Briefs - Men's
$22.73
Save 24%
compared to $30.00
0 reviews
REI OUTLET
New arrival
StanceCompression Nylon Boxer Briefs - Men's
$29.73
Save 23%
compared to $39.00
0 reviews
REI OUTLET
New arrival
StanceCedar Rock Boxer Briefs - Men's
$22.73
Save 24%
compared to $30.00
0 reviews
REI OUTLET
Helly HansenLIFA Merino Midweight Balaclava Base Layer Hoodie - Men's
$104.73
Save 30%
compared to $150.00
0 reviews
REI OUTLET
StanceCurren Boxer Briefs - Men's
$22.73
Save 24%
compared to $30.00
0 reviews
REI OUTLET
Beyond YogaPowerBeyond Strive Longline Bra
$36.83 - $50.93
Save 31% - 50%
compared to $74.00
16 reviews with an average rating of 4.4 out of 5 stars
Ortovox120 Cool Tec Clean Base Layer T-Shirt - Men's
$90.00
0 reviews
SmartwoolIntraknit 6" Boxer Briefs - Men's
$36.73
Save 26%
compared to $50.00
6 reviews with an average rating of 2.8 out of 5 stars
REI OUTLET
SmartwoolActive Crop Bra
$49.73
Save 28%
compared to $70.00
1 reviews with an average rating of 4.0 out of 5 stars
REI OUTLET
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
$78.73
Save 25%
compared to $105.00
122 reviews with an average rating of 4.7 out of 5 stars
REI OUTLET
TerramarAll-Season Merino Wool Boxer Briefs - Men's
$28.73
Save 28%
compared to $40.00
1 reviews with an average rating of 4.0 out of 5 stars
REI OUTLET
Royal RobbinsReadyDry 7" Boxer Briefs - Men's
$21.73
Save 27%
compared to $30.00
2 reviews with an average rating of 3.0 out of 5 stars
REI OUTLET
Top Rated
The North FaceMovmynt Bra
$48.73
Save 25%
compared to $65.00
6 reviews with an average rating of 5.0 out of 5 stars
REI OUTLET
Free CountryMicrotech Heat Cocaber Base Layer Top - Men's
$26.73
Save 33%
compared to $40.00
2 reviews with an average rating of 5.0 out of 5 stars
REI OUTLET
Free CountryMicrotech Heat Base Layer Bottoms - Men's
$31.73
Save 29%
compared to $45.00
2 reviews with an average rating of 5.0 out of 5 stars
REI OUTLET
Top Rated
IcebreakerMerino 260 Tech Thermal Base Layer Leggings - Women's
$93.73
Save 25%
compared to $125.00
20 reviews with an average rating of 4.6 out of 5 stars
REI OUTLET
Free CountryForce Grid Fleece Base Layer Top - Men's
$29.73
Save 33%
compared to $45.00
4 reviews with an average rating of 4.5 out of 5 stars
REI OUTLET
Mountain HardwearMountain Stretch Base Layer Tights - Men's
$55.73
Save 25%
compared to $75.00
10 reviews with an average rating of 4.0 out of 5 stars
REI OUTLET
Free CountryMicrotech Heat Base Layer Top - Men's
$28.73
Save 36%
compared to $45.00
0 reviews
REI OUTLET
tasc PerformanceElevation Merino Base Layer Bottoms - Men's
$49.73 - $54.73
Save 30% - 37%
compared to $79.00
29 reviews with an average rating of 3.8 out of 5 stars
REI OUTLET
Top Rated
SmartwoolIntraknit Hipster Underwear - Women's
$28.73
Save 28%
compared to $40.00
5 reviews with an average rating of 4.8 out of 5 stars
REI OUTLET
Threads 4 ThoughtLunette Sports Bra
$28.73
Save 40%
compared to $48.00
0 reviews
REI OUTLET
SmartwoolIntraknit Strappy Bra
$48.73
Save 25%
compared to $65.00
4 reviews with an average rating of 4.0 out of 5 stars
REI OUTLET
Royal RobbinsReadyDry Full Briefs - Women's
$14.73
Save 33%
compared to $22.00
0 reviews
REI OUTLET
Mountain HardwearYuba Trail Bra
$48.73
Save 25%
compared to $65.00
3 reviews with an average rating of 4.0 out of 5 stars
REI OUTLET
Outdoor ResearchVantage Bra
$39.73
Save 27%
compared to $55.00
2 reviews with an average rating of 4.5 out of 5 stars
REI OUTLET
Threads 4 ThoughtEva Crossover Mesh Sports Bra
$39.73
Save 31%
compared to $58.00
0 reviews
REI OUTLET
Icebreaker200 Oasis Macro Forms Base Layer Leggings - Women's
$85.73
Save 25%
compared to $115.00
4 reviews with an average rating of 5.0 out of 5 stars
REI OUTLET
Kari TraaFryd Base Layer Pants - Women's
$37.73
Save 31%
compared to $55.00
15 reviews with an average rating of 3.5 out of 5 stars
REI OUTLET

241–270 of 512 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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