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Underwear

(565 products)

Products (565)

Sort: Best Match

Kari TraaVar Printed Bra
$32.73
Save 28%
compared to $46.00
4 reviews with an average rating of 4.3 out of 5 stars
REI OUTLET
Top Rated
Icebreaker260 ZoneKnit Base Layer Leggings - Men's
$119.73
Save 27%
compared to $165.00
9 reviews with an average rating of 4.8 out of 5 stars
REI OUTLET
prAnaSculpt Send-Off Bra
$49.73
Save 27%
compared to $69.00
0 reviews
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
Threads 4 ThoughtLunette Camo Print Sports Bra
$39.73
Save 31%
compared to $58.00
0 reviews
REI OUTLET
IcebreakerMerino 260 Vertex Long-Sleeve Half-Zip Herenga Base Layer Top - Women's
$99.73
Save 33%
compared to $150.00
0 reviews
REI OUTLET
IcebreakerMerino Base Layer Leggings - Women's
$149.73
Save 25%
compared to $200.00
3 reviews with an average rating of 4.3 out of 5 stars
REI OUTLET
New arrival
Outdoor ResearchVantage Crop Top
$38.73
Save 29%
compared to $55.00
2 reviews with an average rating of 5.0 out of 5 stars
REI OUTLET
Helly HansenLIFA Merino Midweight 2-In-1 Base Layer Hoodie - Women's
$89.73
Save 25%
compared to $120.00
0 reviews
REI OUTLET
New arrival
StancePlaya Larga Boxer Briefs - Men's
$18.73
Save 25%
compared to $25.00
0 reviews
REI OUTLET
ZoicEveryday Bike Liner Shorts - Women's
$36.73
Save 26%
compared to $50.00
0 reviews
REI OUTLET
SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'
$48.73
Save 25%
compared to $65.00
4 reviews with an average rating of 3.5 out of 5 stars
REI OUTLET
SmartwoolIntraknit Crop Bra
$51.73
Save 26%
compared to $70.00
9 reviews with an average rating of 3.3 out of 5 stars
REI OUTLET
tasc PerformanceElevation Merino T-Shirt - Men's
$54.73
Save 30%
compared to $79.00
38 reviews with an average rating of 4.2 out of 5 stars
REI OUTLET
StancePalmoflage Boxer Briefs - Men's
$19.73
Save 34%
compared to $30.00
4 reviews with an average rating of 4.5 out of 5 stars
REI OUTLET
StanceSanta Rips Boxer Briefs - Men's
$22.73
Save 35%
compared to $35.00
0 reviews
REI OUTLET
Top Rated
IcebreakerMerino 200 Sonebula Long-Sleeve High-Neck Base Layer Top - Women's
$93.73
Save 25%
compared to $125.00
6 reviews with an average rating of 4.5 out of 5 stars
REI OUTLET
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
CraftCORE Dry Active Comfort Base Layer Top - Men's
$39.73
Save 38%
compared to $64.95
0 reviews
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$86.73
Save 24%
compared to $115.00
365 reviews with an average rating of 4.7 out of 5 stars
REI OUTLET
StanceWebbed Boxer Briefs - Men's
$19.73
Save 26%
compared to $27.00
0 reviews
REI OUTLET
Kari TraaMalia Long-Sleeve Base Layer Top - Women's
$52.73
Save 24%
compared to $70.00
0 reviews
REI OUTLET
Top Rated
Sweaty BettyHigh-Neck Jacquard Base Layer Top - Women's
$82.73
Save 29%
compared to $118.00
22 reviews with an average rating of 4.7 out of 5 stars
REI OUTLET
ArtilectFlatiron 185 Crew Base Layer Top - Men's
$96.73 - $109.73
Save 30% - 31%
compared to $140.00 - $160.00
0 reviews
REI OUTLET
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's
$97.73
Save 24%
compared to $130.00
119 reviews with an average rating of 4.3 out of 5 stars
REI OUTLET
SmartwoolIntraknit Racerback Bra
$46.73
Save 28%
compared to $65.00
2 reviews with an average rating of 3.0 out of 5 stars
REI OUTLET
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Macro Forms Base Layer Top - Women's
$85.73
Save 25%
compared to $115.00
3 reviews with an average rating of 3.7 out of 5 stars
REI OUTLET
Threads 4 ThoughtPerformance Rib Sports Bra
$32.73
Save 31%
compared to $48.00
0 reviews
REI OUTLET
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$78.73
Save 25%
compared to $105.00
60 reviews with an average rating of 4.6 out of 5 stars
REI OUTLET
Boody Eco WearLYOLYTE Racerback Bra - Package of 2
$43.73
Save 18%
compared to $53.90
2 reviews with an average rating of 5.0 out of 5 stars
REI OUTLET

361–390 of 565 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