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Outdoor Underwear
(518 products)Products (518)
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- SpraywayEffra Hoody Base Layer Top - Women's$49.73Save 28%compared to  $69.95Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- CraftCore Dry Active Comfort Base Layer Pants - Women's$29.73Save 33%compared to  $44.95Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- Arc'teryxLana Merino Wool Crew Base Layer Top - Women's$90.00
- SpraywayEffra Leggings Base Layer Bottoms - Women's$36.73Save 26%compared to  $49.95Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- SmartwoolIntraknit Racerback Bra$75.00
- Kari TraaMalia Long-Sleeve Base Layer Top - Women's$52.73Save 24%compared to  $70.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- TerramarC-Suite Mammoth Sherpa Fleece Mid-Layer Pants - Men's$56.73Save 29%compared to  $80.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- The North FaceSummit Pro 120 Base Layer Tights - Women's$100.00
- Icebreaker200 Sonebula Leggings - Men's$89.73Save 25%compared to  $120.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- SmartwoolIntraknit Racerback Bra$46.73Save 28%compared to  $65.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Women'sTop Rated$99.73Save 26%compared to  $135.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- CraftCore Dry Active Comfort Base Layer Pants - Men's$32.73Save 34%compared to  $49.95Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- Kari TraaEmbla Wool Base Layer Top - Women's$60.00
- Kari TraaMina Long-Sleeve Base Layer Top - Women's$44.73Save 25%compared to  $60.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- prAnaLuxara Rib Racerback Bralette$58.00
- SmartwoolClassic All Season Merino Long-Sleeve Base Layer Top - Men'sTop Rated$66.73Save 25%compared to  $90.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- Boody Eco WearFull Briefs - Women's - Package of 2$25.73Save 19%compared to  $31.95Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- OiselleBoom Bra - Women's$78.00 - $92.00
- Kari TraaEmbla Wool Long-Sleeve Base Layer Top - Women's$80.00
- TerramarC-Suite Mammoth Sherpa Fleece Mid-Layer Joggers - Women's$56.73Save 29%compared to  $80.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- Royal RobbinsReadyDry Briefs - Men's$14.73Save 33%compared to  $22.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- Helly HansenHH Durawool Crew Long-Sleeve Base Layer - Women's$90.00
- The North FaceSummit Series Pro 120 Base Layer Tights - Women'sTop Rated$100.00
- Beyond YogaSpacedye Outlines Bra$70.00
- Kari TraaLucie Half-Zip Base Layer Top - Women's$67.73Save 24%compared to  $90.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- BrooksLuxe Pocket Sports Bra$55.00
- Helly HansenHH Durawool Graphic T-Shirt - Women's$90.00
- Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Thermal Top - Women's$93.73Save 25%compared to  $125.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- OiselleSquared Up Bra$64.00 - $78.00
- IcebreakerMerino 260 Tech Thermal Base Layer Leggings - Women'sTop Rated$93.73Save 25%compared to  $125.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
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