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- SmartwoolIntraknit Thermal Max Merino Base Layer Pattern Hoodie - Women's$114.73Save 30%compared to  $165.00Size Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Lettuce Edge Base Layer Bottoms - Women's$82.73Save 28%compared to  $115.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SaxxRoast Master Midweight Long-Sleeve Crew Base Layer Top - Men's$47.73Save 36%compared to  $75.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Kari TraaElse Base Layer Pants - Women's$74.73Save 25%compared to  $100.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Thermal Merino Pattern Crew Base Layer Top - Women's$96.73Save 25%compared to  $130.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Helly HansenGraphic Lifa Merino Base Layer Set - Kids'$74.73Save 32%compared to  $110.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- CraftCORE Dry Active Comfort Base Layer Top - Men's$39.73Save 38%compared to  $64.95Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Terramar3.0 Thermawool Crew Base Layer Top - Women's$49.73 - $52.73Save 24% - 28%compared to  $70.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- ArtilectDarkhorse 185 Zoned Crew Base Layer Top - Men'sTop Rated$109.73Save 31%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- ArtilectFlatiron 185 Crew Base Layer Top - Men's$96.73 - $109.73Save 30% - 31%compared to  $140.00 - $160.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Picture Organic ClothingNangha Base Layer Top - Men's$44.83Save 50%compared to  $90.00Underwear Weight:MidweightSize Type:Regular
- SmartwoolIntraknit Active Base Layer Bottoms - Women's$76.73Save 30%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Men's$99.73Save 26%compared to  $135.00Underwear Weight:HeavyweightSize Type:Regular, BigREI OUTLET
- Hot ChillysClima-Wool Crew Base Layer Top - Men's$79.73Save 33%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Arc'teryxRho Boot Cut Base Layer Bottoms - Women's$72.73Save 19%compared to  $90.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SpraywayEffra Crew Base Layer Top - Women's$36.73Save 26%compared to  $49.95Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- Kari TraaRose High-Waist Base Layer Pants - Women's$79.73Save 27%compared to  $110.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Helly HansenLIFA Merino Midweight Graphic Base Layer Pants - Women's$79.73Save 27%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Arc'teryxIonia Merino Wool Base Layer Top - Men'sTop Rated$63.93Save 28%compared to  $90.00Underwear Weight:MidweightSize Type:Big
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Women'sTop Rated$99.73Save 26%compared to  $135.00Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- ArtilectFlatiron 185 Base Layer Leggings - Men's$99.73Save 37%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Helly HansenLIFA Merino Midweight 2-In-1 Base Layer Hoodie - Women's$86.73Save 27%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaRose High-Waisted Base Layer Pants - Women's$54.83 - $130.00Underwear Weight:LightweightSize Type:Regular
- Kari TraaRose Half-Zip Base Layer Top - Women'sTop Rated$89.73Save 25%compared to  $120.00Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- Arc'teryxRho Hybrid Insulated Base Layer Bottoms - Women's$145.73Save 19%compared to  $180.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Helly HansenLIFA Merino Midweight Half-Zip Base Layer Top - Women's$82.73Save 24%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino 260 Tech Thermal Base Layer Leggings With Fly - Men'sTop Rated$93.73Save 25%compared to  $125.00Underwear Weight:HeavyweightSize Type:Regular, BigREI OUTLET
- IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men'sTop Rated$78.73Save 25%compared to  $105.00Underwear Weight:LightweightSize Type:Big, RegularREI OUTLET
- BurtonMidweight Base Layer Pants - Women's$19.83Save 69%compared to  $64.95Underwear Weight:MidweightSize Type:Regular
- Terramar3.0 Thermawool Base Layer Tights - Women's$52.73Save 24%compared to  $70.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
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