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- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men'sTop Rated$39.83 - $79.95Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMidweight Long-Sleeve Base Layer Top - Women's$37.93 - $54.95Underwear Weight:MidweightSize Type:Regular, Plus
- REI Co-opMidweight Base Layer Half-Zip Top - Men'sTop Rated$29.83 - $59.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's$62.93 - $90.00Underwear Weight:LightweightSize Type:Regular, Plus
- REI Co-opMidweight Base Layer Half-Zip Top - Women's$19.83 - $59.95Underwear Weight:MidweightSize Type:Regular, Plus
- SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's$69.93 - $115.00Underwear Weight:MidweightSize Type:Regular
- REI Co-opMidweight Long-Sleeve Base Layer Top - Men'sTop Rated$37.93 - $54.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- SmartwoolClassic All-Season Merino T-Shirt - Men's$59.93 - $80.00Underwear Weight:LightweightSize Type:Regular, Big
- SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men'sTop Rated$66.93 - $90.00Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMidweight Base Layer Tights - Women's$37.93 - $54.95Underwear Weight:MidweightSize Type:Regular, Plus, Petite
- SmartwoolClassic All-Season Merino T-Shirt - Women's$59.93 - $80.00Underwear Weight:LightweightSize Type:Regular, Plus
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Women'sTop Rated$81.73Save 28%compared to  $115.00Underwear Weight:MidweightSize Type:Regular, PlusREI OUTLET
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men'sTop Rated$49.83 - $89.95Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$62.93 - $89.95Underwear Weight:LightweightSize Type:Regular
- REI Co-opMidweight Base Layer Bottoms - Men's$37.93 - $54.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Men'sTop Rated$69.83 - $115.00Underwear Weight:MidweightSize Type:Regular, Big
- SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's$81.73Save 28%compared to  $115.00Underwear Weight:MidweightSize Type:Plus, RegularREI OUTLET
- SmartwoolIntraknit Active Base Layer Bottoms - Women's$59.83Save 45%compared to  $110.00Underwear Weight:LightweightSize Type:Regular
- REI Co-opMerino 185 Base Layer Top - Women's$48.93 - $69.95Underwear Weight:LightweightSize Type:Regular
- Arc'teryxRho LT Base Layer Bottoms - Men's$49.83 - $100.00Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMidweight Base Layer Crew Top - Kids'Top Rated$23.93 - $34.95Underwear Weight:MidweightSize Type:Regular
- SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women'sTop Rated$39.83 - $120.00Underwear Weight:MidweightSize Type:Regular, Plus
- REI Co-opMidweight Base Layer Bottoms - Kids'Top Rated$23.93 - $34.95Underwear Weight:MidweightSize Type:Regular
- IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women'sTop Rated$78.73Save 25%compared to  $105.00Size Type:Regular, PlusREI OUTLET
- SmartwoolIntraknit Active Long-Sleeve Base Layer Top - Women's$59.83Save 45%compared to  $110.00Underwear Weight:MidweightSize Type:Regular
- tasc PerformanceElevation Merino Base Layer Bottoms - Women's$49.73Save 37%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's$70.93 - $95.00Underwear Weight:MidweightSize Type:Regular, Big
- tasc PerformanceElevation Merino T-Shirt - Men's$49.73Save 37%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Men'sTop Rated$85.73Save 25%compared to  $115.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'$44.73Save 31%compared to  $65.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
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