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- REI Co-opMerino 185 Base Layer Bottoms - Men's$39.83 - $79.95Underwear Weight:LightweightSize Type:Regular, Big
- SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's$62.93 - $90.00Underwear Weight:LightweightSize Type:Regular, Plus
- SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men'sTop Rated$66.93 - $90.00Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's$55.93 - $79.95Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMidweight Base Layer Half-Zip Top - Women's$29.83 - $59.95Underwear Weight:MidweightSize Type:Regular, Plus
- tasc PerformanceElevation Merino T-Shirt - Women'sTop Rated$49.73Save 37%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's$92.73Save 28%compared to  $130.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Women'sTop Rated$59.83 - $115.00Underwear Weight:MidweightSize Type:Regular, Plus
- SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's$66.93 - $90.00Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's$55.93 - $79.95Underwear Weight:LightweightSize Type:Regular
- SmartwoolClassic All-Season Merino T-Shirt - Women's$55.93 - $80.00Underwear Weight:LightweightSize Type:Regular, Plus
- SmartwoolClassic All-Season Merino T-Shirt - Men's$59.93 - $80.00Underwear Weight:LightweightSize Type:Regular, Big
- SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women'sTop Rated$59.83 - $120.00Underwear Weight:MidweightSize Type:Regular, Plus
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$44.83 - $89.95Underwear Weight:LightweightSize Type:Regular
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Men'sTop Rated$85.93 - $115.00Underwear Weight:MidweightSize Type:Regular, Big
- REI Co-opHeavyweight Merino Base Layer Bottoms - Women'sTop Rated$49.83 - $69.93Save 30% - 50%compared to  $99.95Underwear Weight:HeavyweightSize Type:Regular, Plus
- Wild RyeEvie Raglan Base Layer Top - Women'sTop Rated$61.83Save 50%compared to  $125.00Underwear Weight:LightweightSize Type:Regular, Plus
- REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's$49.83 - $104.95Underwear Weight:HeavyweightSize Type:Regular, Big, Tall
- REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Women'sTop Rated$49.83 - $99.95Underwear Weight:HeavyweightSize Type:Regular, Plus
- REI Co-opMerino 185 Base Layer Top - Women's$48.93 - $69.95Underwear Weight:LightweightSize Type:Regular
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men'sTop Rated$62.93 - $89.95Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women'sTop Rated$49.83 - $104.95Underwear Weight:HeavyweightSize Type:Regular, Plus
- SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's$70.93 - $95.00Underwear Weight:MidweightSize Type:Regular, Big
- Kari TraaFryd Base Layer Top - Women's$29.83 - $60.00Underwear Weight:MidweightSize Type:Regular
- REI Co-opLightweight Base Layer Tights - Women's Plus Sizes$9.83Save 75%compared to  $39.95Underwear Weight:LightweightSize Type:Plus
- Arc'teryxRho Heavyweight Base Layer Bottoms - Men'sTop Rated$84.83Save 29%compared to  $120.00Underwear Weight:HeavyweightSize Type:Regular, Big
- Arc'teryxRho LT Crew Neck Base Layer Top - Men'sTop Rated$59.83 - $100.00Underwear Weight:LightweightSize Type:Regular, Big
- tasc PerformanceElevation Merino Base Layer Bottoms - Women's$49.73Save 37%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's$49.83 - $99.95Underwear Weight:HeavyweightSize Type:Regular, Big, Tall
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes$44.83 - $89.95Underwear Weight:LightweightSize Type:Plus
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