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Underwear
(542 products)Products (542)
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- REI Co-opLightweight Base Layer Bottoms - Kids'Top Rated$29.95
- REI Co-opLightweight Crew Base Layer Top - Infants'/Toddlers'Top Rated$19.95
- Icebreaker200 Oasis 3/4 Base Layer Bottoms - Men's$95.00
- SmartwoolIntraknit Thermal Merino Base Layer 3/4 Bottoms - Men's$120.00
- Helly HansenLIFA Merino Midweight Base Layer Set - Kids'$100.00
- Helly HansenLIFA Merino Midweight 2-In-1 Base Layer Hoodie - Men's$89.73Save 25%compared to  $120.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- PatagoniaCapilene Midweight Base Layer Bottoms - Infants'$21.73Save 25%compared to  $29.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- Helly HansenLifa Merino Midweight Crew Base Layer Top - Men's$100.00
- REI Co-opLightweight Base Layer Bottoms - Infants'/Toddlers'Top Rated$19.95
- KUHLReactiv Lite Grid Long-Sleeve Crew Base Layer Top - Men'sNew arrival$109.00
- KUHLReactiv Lite Grid Quarter-Zip Base Layer Top - Men'sNew arrival$119.00
- Arc'teryxRho Insulated 3/4 Base Layer Bottoms - Men'sTop Rated$159.73Save 20%compared to  $200.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- KUHLReactiv Lite Grid Base Layer Bottoms - Men'sNew arrival$99.00
- Helly HansenHH LIFA Base Layer Set - Kids'$70.00
- Terramar1.0 All-Season Lightweight Merino Wool T-Shirt - Women's$34.73Save 30%compared to  $50.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes$62.93 - $89.95
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's Plus Sizes$55.93 - $79.95
- Icebreaker260 Tech Long-Sleeve Crewe Base Layer Top - Women'sTop Rated$125.00
- PatagoniaBaby Capilene Midweight Henley Base Layer Top - Infants'$23.93Save 31%compared to  $35.00
- REI Co-opLightweight Base Layer Tights - Women's Plus Sizes$9.83Save 75%compared to  $39.95
- BurtonMidweight Base Layer Pants - Women's$19.83Save 69%compared to  $64.95
- Kari TraaFryd Base Layer Pants - Women's$60.00
- SeirusHeatwave Body Mapped Full-Length Base Layer Bottoms - Women's$59.83Save 50%compared to  $119.95
- Arc'teryxRho Boot Cut Base Layer Bottoms - Women's$72.73Save 19%compared to  $90.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
- REI Co-opMidweight Base Layer Half-Zip Top - Women's$19.83 - $59.95
- REI Co-opMerino 185 Base Layer Top - Women's$48.93 - $69.95
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's$55.93 - $79.95
- PatagoniaCapilene Thermal Weight Long Underwear Bottoms - Women's$99.00
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Women'sTop Rated$59.83 - $115.00
- PatagoniaCapilene Thermal Weight Zip-Neck Long Underwear Top - Women's$109.00
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