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Underwear
(561 products)Products (561)
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- CraftCore Dry Active Comfort Base Layer Pants - Women's$29.73Save 33%compared to  $44.95Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men'sTop Rated$125.00Underwear Weight:HeavyweightSize Type:Regular, Big
- PatagoniaCapilene Thermal Weight Long Underwear Bottoms - Women's$99.00Underwear Weight:HeavyweightSize Type:Regular
- PatagoniaCapilene Thermal Weight Zip-Neck Long Underwear Top - Women's$109.00Underwear Weight:HeavyweightSize Type:Regular
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Men's$135.00Underwear Weight:MidweightSize Type:Regular, Big
- REI Co-opMerino 185 Base Layer Bottoms - Women's Plus Sizes$79.95Underwear Weight:LightweightSize Type:Plus
- Helly HansenLIFA Merino Midweight Half-Zip Base Layer Top - Women's$79.73 - $82.73Save 24% - 27%compared to  $110.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Icebreaker260 Merino Tech Thermal Leggings with Fly - Men'sTop Rated$125.00Underwear Weight:HeavyweightSize Type:Regular, Big
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's Tall SizesTop Rated$89.95Underwear Weight:LightweightSize Type:Tall, Big
- Arms of Andes300 Alpaca Wool Long-Sleeve Crew Base Layer Top - Men's$130.00 - $140.00Underwear Weight:LightweightSize Type:Regular, Big
- Kari TraaSmekker Long-Sleeve Base Layer Top - Women's$89.73Save 25%compared to  $120.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:LightweightSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Base Layer Bottoms - Kids'Top Rated$46.73Save 28%compared to  $65.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Lettuce Edge Crew Base Layer Top - Women's$82.73Save 28%compared to  $115.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Boody Eco WearBoyleg Briefs - Women's - Package of 2$22.73Save 18%compared to  $27.95Members use code LABORDAY2025 for an extra 20% off at REI OutletSize Type:RegularREI OUTLET
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's Tall SizesTop Rated$79.95Underwear Weight:LightweightSize Type:Tall, Big
- Arc'teryxRho Zip-Neck Base Layer Top - Women'sTop Rated$79.93 - $120.00Underwear Weight:LightweightSize Type:Regular, Plus
- Arc'teryxRho Hybrid Insulated Base Layer Bottoms - Women's$145.73Save 19%compared to  $180.00Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- REI Co-opMerino Midweight Base Layer Bottoms - Kids'Top Rated$49.95Underwear Weight:MidweightSize Type:Regular
- SmartwoolIntraknit Thermal Merino Colorblock Quarter-Zip Base Layer Top - Women's$140.00Underwear Weight:MidweightSize Type:Regular
- SmartwoolIntraknit Thermal Max Merino Base Layer Bottoms - Women's$100.73Save 25%compared to  $135.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Ortovox185 Rock'n'wool Short Base Layer Pants - Men's$49.83Save 50%compared to  $100.00Underwear Weight:MidweightSize Type:Regular, Big
- SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's$92.73Save 28%compared to  $130.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:LightweightSize Type:RegularREI OUTLET
- BrooksConvertible 2.0 Sports Bra$41.93 - $41.99Save 30%compared to  $60.00Bra Support:High ImpactSupport Style:CompressionFabric:Shell 1: 79% recycled polyester/21% spandex; shell 2: 78% recycled polyester/22% spandex
- SaxxKinetic Light-Compression Mesh Boxer Brief$28.73Save 24%compared to  $38.00Members use code LABORDAY2025 for an extra 20% off at REI OutletSize Type:RegularREI OUTLET
- Kari TraaEmbla Wool Base Layer Top - Women's$29.83Save 50%compared to  $60.00Underwear Weight:UltralightweightSize Type:Regular
- Arc'teryxIonia Merino Wool Base Layer Hoody - Men'sTop Rated$98.93Save 29%compared to  $140.00Underwear Weight:MidweightSize Type:Regular, Big
- SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men'sTop Rated$120.00Underwear Weight:MidweightSize Type:Regular, Big
- REI Co-opMerino Bikini Underwear - Women's$27.95Size Type:Regular, Plus
- Free CountryForce Grid Fleece Crew Base Layer Top - Men'sTop Rated$26.73Save 40%compared to  $45.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:LightweightSize Type:BigREI OUTLET
- IcebreakerMerino 200 Oasis Thermal Base Layer Leggings - Women's$78.73Save 25%compared to  $105.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:Regular, PlusREI OUTLET
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