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- KUHLReactiv Lite Grid Base Layer Bottoms - Men'sTop Rated$99.00Underwear Weight:LightweightSize Type:Regular, Big
- Helly HansenLIFA Merino Midweight 2-In-1 Graphic Half-Zip Base Layer Top - Women's$93.73Save 25%compared to $125.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Ortovox120 Comp Light Base Layer Hoody - Men's$120.00Underwear Weight:LightweightSize Type:Regular, Big
- Sale Ends May 25Kari TraaAlma T-Shirt - Women's$55.99Save 30%compared to $80.00Underwear Weight:LightweightSize Type:Regular
- Ortovox185 Rock'N'Wool Short Base Layer Pants - Men's$100.00 - $110.00Underwear Weight:LightweightSize Type:Regular, Big
- Arc'teryxRho LT Base Layer Bottoms - Men's$79.73Save 20%compared to $100.00Underwear Weight:MidweightSize Type:BigREI OUTLET
- Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Men's$84.73Save 26%compared to $115.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Arc'teryxRho SV Base Layer Bottoms - Men's$69.83Save 41%compared to $120.00Underwear Weight:HeavyweightSize Type:Big
- Hot ChillysOriginals Print Base Layer Crew - Kids'$39.73Save 27%compared to $55.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- RHONEApres Houndstooth Seamless Base Layer Leggings - Women's$88.93Save 30%compared to $128.00Underwear Weight:LightweightSize Type:Regular
- Helly HansenLIFA Merino Midweight Graphic Crew Base Layer - Women's$85.73Save 25%compared to $115.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaFierce Base Layer Pants - Women's$45.73Save 30%compared to $66.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Sale Ends May 25Kari TraaFryd Long-Sleeve Base Layer Top - Women's$44.73Save 31%compared to $65.00Underwear Weight:LightweightSize Type:PlusREI OUTLET
- Hot ChillysOriginals Solid Base Layer Crew - Kids'$34.73Save 26%compared to $47.50Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Hot ChillysPeach Skins T-Neck Base Layer Top - Kids'$32.73Save 34%compared to $50.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Ortovox230 Competition Long-Sleeve Base Layer Top - Men's$110.00Underwear Weight:MidweightSize Type:Regular, Big
- Ortovox230 Competition Long Base Layer Pants - Men's$100.00Underwear Weight:MidweightSize Type:Regular, Big
- Hot ChillysOriginals Print Base Layer Pants - Kids'$39.73Save 27%compared to $55.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- RHONEApres Houndstooth Quarter-Zip Base Layer Top - Women's$102.93Save 30%compared to $148.00Underwear Weight:LightweightSize Type:Regular
- StioBasisPeak Wool Midweight Base Layer Tights - Women's$149.00Add to cart to see priceUnderwear Weight:MidweightSize Type:Regular
- StioBasis PeakWool Midweight Base Layer Tights - Men's$149.00Add to cart to see priceUnderwear Weight:MidweightSize Type:Big
- Wild RyeBassett Half-Zip Base Layer Top - Women's$49.83Save 63%compared to $135.00Underwear Weight:MidweightSize Type:Regular
- SmartwoolClassic Thermal Merino Colorblock Crew Base Layer Top - Women'sTop Rated$49.83Save 61%compared to $130.00Underwear Weight:MidweightSize Type:Regular
- Wild RyeBassett Base Layer Leggings - Women's$39.83Save 65%compared to $115.00Underwear Weight:MidweightSize Type:Regular
- Wild RyeBassett LITE Raglan Base Layer Top - Women's$29.83Save 69%compared to $99.00Underwear Weight:LightweightSize Type:Regular, Plus
- REI Co-opMerino 185 Base Layer Bottoms - Women's Plus Sizes$19.83Save 75%compared to $79.95Underwear Weight:LightweightSize Type:Plus
- Wild RyeBassett LITE Base Layer Leggings - Women's$29.83Save 66%compared to $89.00Underwear Weight:LightweightSize Type:Regular, Plus
- HalfdaysJohnson Base Layer Top - Women's$29.83Save 68%compared to $95.00Underwear Weight:UltralightweightSize Type:Regular
- Arms of Andes300 Alpaca Wool Long-Sleeve Crew Base Layer Top - Men's$49.83Save 61% - 64%compared to $130.00 - $140.00Underwear Weight:LightweightSize Type:Big, Regular
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes$19.83Save 77%compared to $89.95Underwear Weight:LightweightSize Type:Plus
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