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Underwear
(524 products)Products (524)
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- Icebreaker200 Oasis Crewe Base Layer Top - Men'sTop Rated$95.00Underwear Weight:MidweightSize Type:Regular, Big
- Kari TraaEmbla Wool Base Layer Top - Women's$60.00Underwear Weight:UltralightweightSize Type:Regular
- StancePoppyland Boxer Briefs - Men's$18.73Save 25%compared to  $25.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- Helly HansenOdin Power Stretch Half-Zip Base Layer Top - Women's$88.73Save 40%compared to  $150.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaFloke Long-Sleeve Base Layer Top - Women's$74.73Save 25%compared to  $100.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- StanceSandy Beach Boxer Briefs - Men's$19.73Save 26%compared to  $27.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- SmartwoolIntraknit Active Base Layer Bottoms - Men's$81.73Save 25%compared to  $110.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- SmartwoolIntraknit Thermal Max Merino Quarter-Zip Base Layer Top - Men's$155.00Underwear Weight:MidweightSize Type:Regular, Big
- StanceTwo Tone Boxer Briefs - Men's$22.73Save 24%compared to  $30.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- SmartwoolIntraknit Active Base Layer Crew Shirt - Women's$76.73Save 30%compared to  $110.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Ortovox185 Rock'n'wool Short Base Layer Pants - Men's$100.00Underwear Weight:MidweightSize Type:Regular, Big
- Kari TraaEmbla Wool Long-Sleeve Base Layer Top - Women's$80.00Underwear Weight:UltralightweightSize Type:Regular
- StanceCompression Nylon Boxer Briefs - Men's$29.73Save 23%compared to  $39.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- StanceOcean Blue Boxer Briefs - Men's$22.73Save 24%compared to  $30.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- Arms of Andes160 Ultralight Alpaca Wool Long-Sleeve Base Layer Shirt - Men's$85.00Underwear Weight:UltralightweightSize Type:Regular, Big
- StanceSunrise Boxer Briefs - Men's$18.73Save 25%compared to  $25.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- Arc'teryxRho Merino Wool Crew Neck Base Layer Top - Men'sTop Rated$59.83 - $120.00Underwear Weight:MidweightSize Type:Big, Regular
- Helly HansenVerglas Half-Zip Top - Women's$63.73Save 25%compared to  $85.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:LightweightSize Type:RegularREI 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 OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's Plus Sizes$115.00 - $120.00Underwear Weight:MidweightSize Type:Plus
- Nani SwimwearUinta Base Layer Top - Women's$29.83Save 62%compared to  $80.00Underwear Weight:MidweightSize Type:Regular, Plus
- BrooksCrossback 2.0 Sports Bra$65.00Bra Support:Medium ImpactSupport Style:EncapsulationFabric:63% nylon/37% spandex spacer
- Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Top - Men's$125.00Underwear Weight:LightweightSize Type:Regular, Big
- PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's$99.00Underwear Weight:MidweightSize Type:Regular
- Free CountryForce Grid Fleece Crew Base Layer Top - Men'sTop Rated$26.73Save 40%compared to  $45.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:LightweightSize Type:BigREI OUTLET
- SaxxTraining Shorts Liner - Men's$29.73Save 25%compared to  $40.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- Boody Eco WearLYOLYTE G-String Underwear - Package of 2 - Women's$25.73Save 19%compared to  $31.90Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- StancePop End Boxer Briefs - Men's$19.73Save 26%compared to  $27.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- PatagoniaCapilene Midweight Base Layer Bottoms - Men'sTop Rated$89.00Underwear Weight:MidweightSize Type:Regular, Big
- Mountain HardwearMountain Stretch Base Layer Tights - Men's$46.73Save 37%compared to  $75.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:BigREI OUTLET
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