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- Sale Ends May 26REI Co-opLightweight Base Layer Crew Top - Kids'Top Rated$20.89Save 30%compared to  $29.95Underwear Weight:LightweightSize Type:Regular
- Sale Ends May 26REI Co-opLightweight Base Layer Bottoms - Infants'/Toddlers'Top Rated$13.89Save 30%compared to  $19.95Underwear Weight:LightweightSize Type:Regular
- Arc'teryxKyanite Base Layer Crew Top - Women's$72.83Save 39%compared to  $120.00Underwear Weight:HeavyweightSize Type:Regular
- Arc'teryxRho Merino Wool Crew Neck Base Layer Top - Men'sTop Rated$84.83Save 29%compared to  $120.00Underwear Weight:MidweightSize Type:Big, Regular
- BurtonMidweight X Base Layer Long Neck Hoodie - Women'sTop Rated$44.83Save 50%compared to  $89.95Underwear Weight:MidweightSize Type:Regular
- Icebreaker125 ZoneKnit Base Layer Leggings - Women's$61.83Save 50%compared to  $125.00Underwear Weight:LightweightSize Type:Regular
- Kari TraaFaith Half-Zip Base Layer Top - Women's$59.83Save 50%compared to  $120.00Underwear Weight:HeavyweightSize Type:Regular
- SeirusHeatwave Body Mapped Quarter-Zip Long-Sleeve Base Layer Top - Women's$69.83Save 50%compared to  $140.00Underwear Weight:MidweightSize Type:Regular
- SmartwoolIntraknit Thermal Merino Colorblock Crew Base Layer Top - Men's$64.83Save 50%compared to  $130.00Underwear Weight:LightweightSize Type:Regular
- BurtonHeavyweight X Base Layer Pants - Women's$49.83Save 50%compared to  $99.95Underwear Weight:HeavyweightSize Type:Regular
- Kari TraaFaith Base Layer Pants - Women's$54.83Save 50%compared to  $110.00Underwear Weight:HeavyweightSize Type:Regular
- SmartwoolIntraknit Thermal Merino Colorblock Quarter-Zip Base Layer Top - Women's$97.93Save 30%compared to  $140.00Underwear Weight:MidweightSize Type:Regular
- Arc'teryxRho Heavyweight Zip-Neck Base Layer Top - Men'sTop Rated$98.83Save 29%compared to  $140.00Underwear Weight:HeavyweightSize Type:Regular
- SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women'sTop Rated$83.93 - $89.99Save 25% - 30%compared to  $120.00Underwear Weight:MidweightSize Type:Regular, Plus
- Arc'teryxRho Merino Wool Base Layer Bottoms - Men's$96.93Save 19%compared to  $120.00Underwear Weight:LightweightSize Type:Regular, Big
- Wild RyeJane 7/8 Base Layer Leggings - Women's$56.83Save 50%compared to  $115.00Underwear Weight:LightweightSize Type:Regular
- BurtonMidweight Base Layer Crew Top - Women's$31.83Save 50%compared to  $64.95Underwear Weight:MidweightSize Type:Regular
- REI Co-opHeavyweight Merino Base Layer Bottoms - Men's$49.83Save 50%compared to  $99.95Underwear Weight:HeavyweightSize Type:Big, Tall
- HalfdaysJohnson Base Layer Top - Women's$62.93Save 25%compared to  $85.00Underwear Weight:UltralightweightSize Type:Regular, Plus
- Kari TraaSara Half-Zip Base Layer Top - Women's$54.83Save 50%compared to  $110.00Underwear Weight:HeavyweightSize Type:Regular
- Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Top - Women's$61.83Save 50%compared to  $125.00Underwear Weight:LightweightSize Type:Regular
- SeirusHeatwave Body Mapped Full-Length Base Layer Bottoms - Women's$59.83Save 50%compared to  $119.95Underwear Weight:MidweightSize Type:Regular
- BurtonMidweight Base Layer Pants - Women's$31.83Save 50%compared to  $64.95Underwear Weight:MidweightSize Type:Regular, Plus
- HalfdaysSophia Base Layer Leggings - Women's$62.93Save 25%compared to  $85.00Underwear Weight:LightweightSize Type:Regular, Plus
- Arc'teryxRho LT Zip-Neck Base Layer Top - Men'sTop Rated$84.83 - $120.00Underwear Weight:LightweightSize Type:Regular, Big
- IcebreakerMerino 200 Oasis Long-Sleeve Base Layer Crew Top - Kids'Top Rated$41.93 - $44.99Save 25% - 30%compared to  $60.00Underwear Weight:MidweightSize Type:Regular
- Arc'teryxRho Hoody Base Layer Top - Women'sTop Rated$104.93Save 19%compared to  $130.00Underwear Weight:LightweightSize Type:Regular
- Arc'teryxRho LT Crew Neck Base Layer Top - Men'sTop Rated$70.83 - $100.00Underwear Weight:LightweightSize Type:Regular, Big
- Arc'teryxRho Merino Wool Zip-Neck Base Layer Top - Men's$98.83Save 29%compared to  $140.00Underwear Weight:MidweightSize Type:Regular, Big
- Kari TraaSara Base Layer Pants - Women's$49.83Save 50%compared to  $100.00Underwear Weight:HeavyweightSize Type:Regular
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