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- Sale Ends May 26SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men'sTop Rated$67.49Save 25%compared to $90.00Underwear Weight:LightweightSize Type:Regular, Big
- Helly HansenHH Durawool T-Shirt - Women's$80.00Underwear Weight:LightweightSize Type:Regular
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$66.83 - $101.19Save 25% - 50%compared to $135.00Underwear Weight:MidweightSize Type:Regular
- SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's$64.83 - $97.49Save 25% - 50%compared to $130.00Underwear Weight:MidweightSize Type:Regular, Big
- Arms of Andes300 Lightweight Alpaca Wool Base Layer Leggings - Men's$105.00Underwear Weight:LightweightSize Type:Regular, Big
- Icebreaker260 Tech Long-Sleeve Crewe Base Layer Top - Women'sTop Rated$61.83 - $93.69Save 25% - 50%compared to $125.00Underwear Weight:HeavyweightSize Type:Regular, Plus
- Arc'teryxRho LT Zip-Neck Base Layer Top - Men'sTop Rated$84.83 - $120.00Underwear Weight:LightweightSize Type:Regular, Big
- Helly HansenHH Durawool Crew Long-Sleeve Base Layer - Women's$90.00Underwear Weight:LightweightSize Type:Regular
- Ortovox230 Competition Long-Sleeve Base Layer Top - Men's$110.00Underwear Weight:MidweightSize Type:Regular, Big
- Kari TraaRose Half-Zip Base Layer Top - Women'sTop Rated$59.83 - $83.99Save 30% - 50%compared to $120.00Underwear Weight:MidweightSize Type:Regular
- Arms of Andes300 Lightweight Alpaca Wool Pullover Base Layer Hoodie - Women's$140.00Underwear Weight:LightweightSize Type:Regular
- SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's$64.83 - $97.49Save 25% - 50%compared to $130.00Underwear Weight:MidweightSize Type:Regular
- Arms of Andes160 Ultralight Alpaca Wool Long-Sleeve Base Layer Shirt - Women's$85.00 - $100.00Underwear Weight:UltralightweightSize Type:Regular
- Sale Ends May 26SmartwoolClassic Thermal Merino Base Layer Bottoms - Men'sTop Rated$86.19Save 25%compared to $115.00Underwear Weight:MidweightSize Type:Regular, Big
- Helly HansenLifa Merino Midweight Base Layer Pants - Men's$100.00Underwear Weight:MidweightSize Type:Regular, Big
- Sale Ends May 26REI Co-opMerino 185 Base Layer Top - Women's$48.89Save 30%compared to $69.95Underwear Weight:LightweightSize Type:Regular
- Arc'teryxRho LT Crew Neck Base Layer Top - Men'sTop Rated$70.83 - $100.00Underwear Weight:LightweightSize Type:Regular, Big
- Sale Ends May 26SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's$71.19Save 25%compared to $95.00Underwear Weight:MidweightSize Type:Regular, Big
- Sale Ends May 26SmartwoolClassic All-Season Merino Base Layer Bottoms - Women's$67.49Save 25%compared to $90.00Underwear Weight:LightweightSize Type:Regular, Plus
- PatagoniaCapilene Thermal Weight Long Underwear Bottoms - Women's$99.00Underwear Weight:HeavyweightSize Type:Regular
- Sale Ends May 26REI Co-opLightweight Crew Base Layer Top - Women's$20.89Save 30%compared to $29.95Underwear Weight:LightweightSize Type:Regular, Plus
- Sale Ends May 26SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's$67.49Save 25%compared to $90.00Underwear Weight:LightweightSize Type:Regular, Big
- Sale Ends May 26REI Co-opLightweight Half-Zip Base Layer Top - Men's$31.39Save 30%compared to $44.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- 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
- Sale Ends May 26IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women'sTop Rated$78.69Save 25%compared to $105.00Underwear Weight:MidweightSize Type:Regular, Plus
- Sale Ends May 26REI Co-opLightweight Base Layer Tights - Women's$27.89Save 30%compared to $39.95Underwear Weight:LightweightSize Type:Regular, Plus
- Sale Ends May 26REI Co-opLightweight Crew Base Layer Top - Men's$20.89Save 30%compared to $29.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- Arms of Andes160 Ultralight Alpaca Wool Crew Neck Base Layer T-Shirt - Women's$75.00Underwear Weight:UltralightweightSize Type:Regular
- Arms of Andes300 Lightweight Alpaca Wool Base Layer Leggings - Women'sTop Rated$105.00Underwear Weight:LightweightSize Type:Regular
- Sale Ends May 26IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men'sTop Rated$78.69Save 25%compared to $105.00Underwear Weight:MidweightSize Type:Regular, Big
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