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- PatagoniaCapilene Midweight Crew Base Layer Top - Women'sTop Rated$89.00Underwear Weight:MidweightSize Type:Regular, Plus
- Arc'teryxIonia Merino Wool Base Layer Hoody - Men'sTop Rated$140.00Underwear Weight:MidweightSize Type:Regular, Big
- PatagoniaCapilene Midweight Base Layer Bottoms - Women's$89.00Size Type:Regular, Plus
- PatagoniaCapilene Midweight Crew Base Layer Top - Men'sTop Rated$89.00Underwear Weight:MidweightSize Type:Regular, Big
- Arc'teryxLana Merino Wool Crew Base Layer Top - Women's$90.00Underwear Weight:LightweightSize Type:Regular, Plus
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus SizesTop Rated$44.83 - $62.89Save 30% - 50%compared to $89.95Underwear Weight:LightweightSize Type:Plus
- Arms of Andes160 Ultralight Alpaca Wool Long-Sleeve Base Layer Shirt - Men's$85.00Underwear Weight:UltralightweightSize Type:Regular, Big
- PatagoniaCapilene Thermal Weight Long-Underwear Bottoms - Men's$99.00Underwear Weight:HeavyweightSize Type:Regular
- Arms of Andes300 Lightweight Alpaca Wool Half-Zip Base Layer Top - Men's$135.00Underwear Weight:LightweightSize Type:Regular, Big
- Arms of Andes300 Alpaca Wool Long-Sleeve Crew Base Layer Top - Men's$130.00Underwear Weight:LightweightSize Type:Regular, Big
- Arms of Andes300 Lightweight Alpaca Wool Half-Zip Base Layer Top - Women's$115.00 - $135.00Underwear Weight:LightweightSize Type:Regular
- Arms of Andes160 Ultralight Alpaca Wool Base Layer Leggings - Men's$85.00Underwear Weight:UltralightweightSize Type:Regular, Big
- PatagoniaCapilene Thermal Weight Zip-Neck Top - Men's$109.00Underwear Weight:HeavyweightSize Type:Regular
- REI Co-opMerino 185 Base Layer Bottoms - Women's Plus Sizes$39.83 - $55.89Save 30% - 50%compared to $79.95Underwear Weight:LightweightSize Type:Plus
- Arc'teryxRho Base Layer Bottoms - Women's$70.83 - $100.00Underwear Weight:LightweightSize Type:Regular, Plus
- PatagoniaCapilene Midweight Base Layer Bottoms - Men'sTop Rated$89.00Underwear Weight:MidweightSize Type:Regular
- PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men'sTop Rated$99.00Underwear Weight:MidweightSize Type:Regular, Big
- Arms of Andes160 Ultralight Alpaca Wool Crewneck Base Layer T-Shirt - Men's$75.00Underwear Weight:UltralightweightSize Type:Regular
- Arc'teryxLana Merino Wool Base Layer Tank Top - Women's$90.00Underwear Weight:LightweightSize Type:Regular, Plus
- Arc'teryxRho Zip-Neck Base Layer Top - Women'sTop Rated$120.00Underwear Weight:LightweightSize Type:Regular, Plus
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$44.83 - $62.89Save 30% - 50%compared to $89.95Underwear Weight:LightweightSize Type:Regular
- REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women'sTop Rated$49.83 - $73.39Save 30% - 52%compared to $104.95Underwear Weight:HeavyweightSize Type:Regular, Plus
- Arc'teryxRho LT Base Layer Bottoms - Men's$70.83 - $100.00Underwear Weight:LightweightSize Type:Regular, Big
- PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's$99.00Underwear Weight:MidweightSize Type:Regular
- The North FaceSummit Series Pro 120 Base Layer Tights - Women'sTop Rated$100.00Underwear Weight:UltralightweightSize Type:Plus
- PatagoniaCapilene Thermal Weight Long Underwear Crew Top - Men's$99.00Underwear Weight:HeavyweightSize Type:Regular
- Kari TraaFryd Base Layer Top - Women's$29.83 - $41.99Save 30% - 50%compared to $60.00Underwear Weight:MidweightSize Type:Regular
- PatagoniaCapilene Thermal Weight Zip-Neck Long Underwear Top - Women's$109.00Underwear Weight:HeavyweightSize Type:Regular
- Arc'teryxIonia Merino Wool Base Layer Top - Men'sTop Rated$90.00Underwear Weight:MidweightSize Type:Regular, Big
- Ortovox230 Competition Zip-Neck Base Layer Top - Men's$120.00Underwear Weight:MidweightSize Type:Regular, Big
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