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- REI Co-opMidweight Long-Sleeve Base Layer Top - Women's$26.83 - $54.95Underwear Weight:MidweightSize Type:Regular, Plus
- REI Co-opMidweight Base Layer Tights - Women's$26.83 - $54.95Underwear Weight:MidweightSize Type:Regular, Plus, Petite
- SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men'sTop Rated$44.83 - $90.00Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMidweight Long-Sleeve Base Layer Top - Men'sTop Rated$26.83 - $54.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- tasc PerformanceElevation Merino Base Layer Bottoms - Women's$34.73 - $54.73Save 30% - 56%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's$66.93 - $90.00Underwear Weight:LightweightSize Type:Regular, Plus
- REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men'sTop Rated$29.93 - $39.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- tasc PerformanceElevation Merino T-Shirt - Men's$34.73 - $54.73Save 30% - 56%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- Arc'teryxRho Base Layer Bottoms - Women's$24.83 - $100.00Underwear 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-opMidweight Base Layer Bottoms - Kids'Top Rated$16.83 - $34.95Underwear Weight:MidweightSize Type:Regular
- PatagoniaCapilene Midweight Crew Base Layer Top - Men'sTop Rated$59.93 - $89.00Underwear Weight:MidweightSize Type:Regular, Big
- tasc PerformanceElevation Merino Base Layer Bottoms - Men's$34.73 - $54.73Save 30% - 56%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- Kari TraaFryd Base Layer Pants - Women's$29.83 - $65.00Underwear Weight:MidweightSize Type:Regular
- SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's$81.73Save 28%compared to  $115.00Underwear Weight:MidweightSize Type:Plus, RegularREI OUTLET
- SmartwoolClassic Thermal Merino Base Layer Bottoms - Kids'Top Rated$46.73Save 28%compared to  $65.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- tasc PerformanceElevation Merino T-Shirt - Women's$54.73Save 30%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Kari TraaRose High-Waisted Base Layer Pants - Women's$54.83 - $130.00Underwear Weight:LightweightSize Type:Regular
- SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Men'sTop Rated$89.73Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI 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 - Men'sTop Rated$85.73Save 25%compared to  $115.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Women'sTop Rated$99.73Save 26%compared to  $135.00Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- PatagoniaCapilene Thermal Weight Zip-Neck Top - Men's$69.93 - $109.00Underwear Weight:HeavyweightSize Type:Regular, Big
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'$44.73 - $46.73Save 28% - 31%compared to  $65.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Terramar2.0 Cloud Nine Half-Zip Base Layer Top - Women's$34.73Save 30%compared to  $50.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- PatagoniaCapilene Midweight Base Layer Bottoms - Men'sTop Rated$59.93 - $89.00Underwear Weight:MidweightSize Type:Regular
- Black DiamondSolution 150 Merino Base Layer Bottoms - Women'sTop Rated$79.73Save 27%compared to  $110.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- PatagoniaCapilene Midweight Crew Base Layer Top - Women'sTop Rated$59.93 - $89.00Underwear Weight:MidweightSize Type:Regular, Plus
- Arc'teryxRho LT Base Layer Bottoms - Men's$79.73Save 20%compared to  $100.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Arc'teryxKyanite Base Layer Bottoms - Women'sTop Rated$96.73Save 19%compared to  $120.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
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