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- SENIQWool Sculpt Merino Mock-Neck Long-Sleeve Base Layer Shirt - Women's$99.93 - $128.00Underwear Weight:HeavyweightSize Type:Regular
- PatagoniaCapilene Midweight Base Layer Bottoms - Kids'$28.73Save 26%compared to  $39.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- HalfdaysFay Midweight Merino Base Layer Top - Women's$90.93 - $130.00Underwear Weight:MidweightSize Type:Regular
- PatagoniaCapilene Thermal Weight Zip-Neck Base Layer Top - Women's$69.73Save 36%compared to  $109.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Men's$84.73Save 26%compared to  $115.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Mountain HardwearUp First Tech Fleece Base Layer Bottoms - Men's$74.73Save 25%compared to  $100.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Helly HansenLIFA Merino Midweight Graphic Base Layer Pants - Women's$79.73Save 27%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Free CountryForce Grid Fleece Base Layer Top - Women's$34.73Save 36%compared to  $55.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Free CountryCloud Knit Base Layer Bottoms - Men's$26.73Save 33%compared to  $40.00Underwear Weight:LightweightSize Type:BigREI OUTLET
- PatagoniaCapilene Thermal Weight Crewneck Base Layer Top - Men's$73.73Save 25%compared to  $99.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- HalfdaysHallie Midweight Merino Base Layer Leggings - Women'sTop Rated$89.93 - $130.00Underwear Weight:MidweightSize Type:Regular
- Arc'teryxRho Insulated 3/4 Base Layer Bottoms - Men'sTop Rated$159.73Save 20%compared to  $200.00Underwear Weight:HeavyweightSize Type:Big, RegularREI OUTLET
- Free CountryCloud Knit Crewneck Base Layer Top - Men's$26.73Save 33%compared to  $40.00Underwear Weight:LightweightSize Type:Big, RegularREI OUTLET
- IcebreakerMerino 200 ZoneKnit Long-Sleeve Half-Zip Base Layer Top - Men'sTop Rated$119.73Save 25%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Free CountryForce Grid Fleece Base Layer Bottoms - Women's$34.73Save 36%compared to  $55.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Arms of Andes300 Alpaca Wool Long-Sleeve Crew Base Layer Top - Men's$64.83 - $69.83Save 50%compared to  $130.00 - $140.00Underwear Weight:LightweightSize Type:Regular, Big
- Hot ChillysOriginals Solid Base Layer Crew - Kids'$34.73Save 26%compared to  $47.50Underwear Weight:MidweightSize Type:RegularREI OUTLET
- PatagoniaCapilene Midweight Crew Base Layer Top - Kids'$28.73Save 26%compared to  $39.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Free CountryForce Grid Fleece Base Layer Bottoms - Men's$29.73Save 33%compared to  $45.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- Kari TraaFierce Base Layer Pants - Women's$46.73Save 29%compared to  $66.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Icebreaker200 Sonebula Leggings - Men'sTop Rated$89.73Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:BigREI OUTLET
- Wild RyeBassett LITE Raglan Base Layer Top - Women's$69.83Save 29%compared to  $99.00Underwear Weight:LightweightSize Type:Regular, Plus
- Kari TraaFierce Long-Sleeve Base Layer Top - Women's$46.73Save 29%compared to  $66.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Active Base Layer Bottoms - Men's$81.73Save 25%compared to  $110.00Underwear Weight:MidweightSize Type:BigREI OUTLET
- Free CountryForce Grid Fleece Base Layer Top - Men'sTop Rated$29.73Save 33%compared to  $45.00Underwear Weight:LightweightSize Type:BigREI OUTLET
- TerramarC-Suite Mammoth Sherpa Fleece Mid-Layer Pants - Men's$56.73Save 29%compared to  $80.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- BurtonFleece Base Layer Set - Kids'$48.93Save 30%compared to  $69.95Underwear Weight:MidweightSize Type:Regular
- Arc'teryxRho LT Base Layer Bottoms - Men's$79.73Save 20%compared to  $100.00Underwear Weight:MidweightSize Type:BigREI OUTLET
- Kari TraaSilja 2.0 Base Layer Pants - Women's$54.83Save 50%compared to  $110.00Underwear Weight:HeavyweightSize Type:Regular
- Kari TraaSaga Base Layer Pants - Women's$59.83Save 50%compared to  $120.00Underwear Weight:HeavyweightSize Type:Regular
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