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Outdoor Underwear
(518 products)Products (518)
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- ArtilectBoulder 125 Crew Long-Sleeve Base Layer Top - Women's$75.73Save 36%compared to  $120.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's Tall SizesTop Rated$89.95
- ArtilectDarkhorse 185 Zoned Quarter-Zip Base Layer Top - Women's$116.73Save 31%compared to  $170.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- Kari TraaVoss Cashmere Mix Half-Zip Base Layer Top - Women's$116.73Save 35%compared to  $180.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- ArtilectDarkhorse 185 Zoned Crew Base Layer Top - Women's$98.73Save 38%compared to  $160.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- IcebreakerMerino 200 Oasis Long-Sleeve Base Layer Crew Top - Kids'Top Rated$41.93 - $60.00
- PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's$99.00
- prAnaKimble Bra$46.73Save 28%compared to  $65.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- Ortovox185 Merino Rock'n'wool Long-Sleeve Base Layer Top - Men's$110.00
- adidasPowerReact Training Medium-Support Sports Bra$19.83Save 50%compared to  $40.00
- Kari TraaRose High-Waisted Base Layer Pants - Women's$110.00
- SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's Plus Sizes$115.00 - $120.00
- Icebreaker260 Merino Tech Thermal Leggings with Fly - Men'sTop Rated$125.00
- prAnaSculpt Adjustable Cami$69.00
- IcebreakerMerino 200 Sonebula Long-Sleeve High-Neck Base Layer Top - Men's$93.73Save 25%compared to  $125.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Men'sTop Rated$135.00
- HalfdaysJohnson Base Layer Top - Women's$49.83Save 41%compared to  $85.00
- Ortovox120 Comp Light Base Layer Hoody - Men's$120.00
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'$44.73Save 31%compared to  $65.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's Tall SizesTop Rated$79.95
- Helly HansenLIFA Merino Midweight 2-In-1 Base Layer Pants - Women's$69.73Save 30%compared to  $100.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- ALWRLDALRN Crop Bra$58.00
- Threads 4 ThoughtLunette Sports Bra$28.73Save 40%compared to  $48.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- Arms of Andes300 Alpaca Wool Long-Sleeve Crew Base Layer Top - Men's$130.00
- Kari TraaFryd Base Layer Pants - Women's$44.73Save 25%compared to  $60.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- Wild RyeJane Leggings - Women's$64.73Save 40%compared to  $109.00Members 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
- 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
- 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
- Ortovox230 Competition Zip-Neck Base Layer Top - Men's$120.00
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