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Underwear

(552 products)

Products (552)

Sort: Best Match

PatagoniaShadowlite Mid Impact Bra
$41.73 - $49.73
Save 27% - 39%
compared to $69.00
2 reviews with an average rating of 4.5 out of 5 stars
REI OUTLET
NikeSwoosh Medium Support Bra
$40.00
110 reviews with an average rating of 4.1 out of 5 stars
StanceLucias Floral Boxer Briefs - Men's
$19.73
Save 26%
compared to $27.00
0 reviews
REI OUTLET
BrooksPlunge 3.0 Sports Bra
$45.00
41 reviews with an average rating of 3.9 out of 5 stars
TerramarC-Suite Mammoth Sherpa Fleece Mid-Layer Pants - Men's
$56.73
Save 29%
compared to $80.00
0 reviews
REI OUTLET
StanceNavy Mash Wholester Boxer Briefs - Men's
$26.73
Save 23%
compared to $35.00
0 reviews
REI OUTLET
Top Rated
Beyond YogaSpacedye Slim Racerback Bra
$62.00
183 reviews with an average rating of 4.5 out of 5 stars
Sale Ends Jul 3
prAnaChakara Crop Top - Women's
$36.73
Save 51%
compared to $75.00
0 reviews
REI OUTLET
Top Rated
RHONERevive Longline Bra
$45.93 - $58.00
62 reviews with an average rating of 4.8 out of 5 stars
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
SmartwoolIntraknit Racerback Bra
$48.73
Save 25%
compared to $65.00
8 reviews with an average rating of 3.5 out of 5 stars
REI OUTLET
StanceOde To Cali Boxer Briefs - Men's
$19.73
Save 26%
compared to $27.00
0 reviews
REI OUTLET
OnPerformance Flex Bra
$75.00
4 reviews with an average rating of 5.0 out of 5 stars
StanceRamp Camo Boxer Briefs - Men's
$22.73
Save 24%
compared to $30.00
0 reviews
REI OUTLET
REI Co-opActive Bralette 2.0
$34.95
114 reviews with an average rating of 4.3 out of 5 stars
StanceTakawitz Boxer Briefs - Men's
$19.73
Save 34%
compared to $30.00
2 reviews with an average rating of 5.0 out of 5 stars
REI OUTLET
Outdoor ResearchVantage Printed Crop Top
$38.73
Save 29%
compared to $55.00
1 reviews with an average rating of 4.0 out of 5 stars
REI OUTLET
Beyond YogaSpacedye Simplicity Long Bra
$48.93 - $70.00
53 reviews with an average rating of 4.5 out of 5 stars
StanceAlonzo Boxer Briefs - Men's
$19.73
Save 26%
compared to $27.00
0 reviews
REI OUTLET
Top Rated
adidasPocket Bra
$55.00
32 reviews with an average rating of 4.7 out of 5 stars
adidasPowerReact Training Medium-Support Sports Bra
$19.83
Save 50%
compared to $40.00
23 reviews with an average rating of 4.2 out of 5 stars
Oya Femtech ApparelRemovable Inserts - Women's - Package of 4
$20.00
17 reviews with an average rating of 3.8 out of 5 stars
StanceInvestor Boxer Briefs - Men's
$22.73
Save 24%
compared to $30.00
3 reviews with an average rating of 4.7 out of 5 stars
REI OUTLET
SmartwoolIntraknit Strappy Bra
$75.00
1 reviews with an average rating of 3.0 out of 5 stars
prAnaTornado Bra
$64.00
0 reviews
The North FaceRefina Longline Bra
$60.00
0 reviews
StanceCrosshatch Wholester Boxer Briefs - Men's
$26.73
Save 23%
compared to $35.00
0 reviews
REI OUTLET
Sweaty BettyPower Contour Plunge Bra
$59.73
Save 32%
compared to $88.00
9 reviews with an average rating of 4.1 out of 5 stars
REI OUTLET
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Women's
$135.00
25 reviews with an average rating of 4.6 out of 5 stars
Boody Eco WearLYOLYTE Triangle Bralette - Package of 2
$32.73
Save 17%
compared to $39.90
3 reviews with an average rating of 2.7 out of 5 stars
REI OUTLET

61–90 of 552 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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