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Outdoor Underwear
(515 products)Products (515)
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- Ortovox230 Competition Zip-Neck Base Layer Top - Men's$120.00
- Arms of Andes160 Ultralight Alpaca Wool Base Layer Leggings - Men's$85.00
- Arms of Andes300 Alpaca Wool Long-Sleeve Crew Base Layer Top - Men's$130.00
- ArtilectFlatiron 185 Crew Base Layer Top - Men's$96.73 - $109.73Save 30% - 31%compared to  $140.00 - $160.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men'sTop Rated$105.00
- SmartwoolIntraknit Crop Bra$51.73Save 26%compared to  $70.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- Kari TraaKlara High-Waisted Base Layer Pants - Women's$62.73Save 30%compared to  $90.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- REI Co-opMidweight Base Layer Bottoms - Toddlers'Top Rated$24.95
- Helly HansenLIFA Merino Midweight Graphic Base Layer Pants - Women's$79.73Save 27%compared to  $110.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- prAnaSculpt Send-Off Bra$49.73Save 27%compared to  $69.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- Threads 4 ThoughtPerformance Rib Sports Bra$32.73Save 31%compared to  $48.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- ArtilectGoldhill 125 Zoned Crew Base Layer Top - Men's$79.73Save 38%compared to  $130.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- PatagoniaMaipo Low-Impact Bra$59.00
- PatagoniaShadowlite Mid Impact Bra$49.73Save 27%compared to  $69.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- prAnaSculpt Adjustable Bra$46.73Save 28%compared to  $65.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- Arms of Andes300 Lightweight Alpaca Wool Half-Zip Base Layer Top - Men's$135.00
- HalfdaysJohnson Base Layer Top - Women's$49.83Save 41%compared to  $85.00
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's Tall SizesTop Rated$79.95
- PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men'sTop Rated$99.00
- Kari TraaRose Capri High-Waist Base Layer Bottoms - Women's$100.00
- SmartwoolClassic Thermal Merino 3/4 Base Layer Bottoms - Men'sTop Rated$105.00
- Ortovox185 Rock'n'wool Short Base Layer Pants - Men's$100.00
- PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's$99.00
- SmartwoolIntraknit Strappy Bra$44.73Save 31%compared to  $65.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- Terramar3.0 Thermawool Crew Base Layer Top - Women's$49.73 - $52.73Save 24% - 28%compared to  $70.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- Kari TraaFryd Base Layer Pants - Women's$60.00
- Ortovox230 Competition Long Base Layer Pants - Men's$100.00
- REI Co-opMerino 185 Base Layer Bottoms - Men's Tall Sizes$79.95
- SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's Plus Sizes$115.00 - $120.00
- SeirusHeatwave Body Mapped Quarter-Zip Long-Sleeve Base Layer Top - Women's$69.83Save 50%compared to  $140.00
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