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- Arc'teryxKyanite Base Layer Bottoms - Women'sTop Rated$69.83Save 41%compared to $120.00Underwear Weight:HeavyweightSize Type:Plus, Regular
- PatagoniaCapilene Thermal Weight Zip-Neck Base Layer Top - Men's$69.73Save 36%compared to $109.00Underwear Weight:HeavyweightSize Type: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
- PatagoniaCapilene Midweight Base Layer Bottoms - Kids'$28.73Save 26%compared to $39.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Mock Neck Base Layer Top - Women's$104.73Save 25%compared to $140.00Underwear Weight:MidweightSize 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
- Free CountryCloud Knit Base Layer Bottoms - Men's$20.73Save 48%compared to $40.00Underwear Weight:LightweightSize Type:BigREI OUTLET
- Sale Ends May 25Kari TraaAlma T-Shirt - Women's$55.99Save 30%compared to $80.00Underwear Weight:LightweightSize Type:Regular
- Sale Ends May 25Kari TraaFryd Base Layer Pants - Women's$28.49Save 48% - 52%compared to $55.00 - $60.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- ObermeyerComfy Cozy Base Layer Set - Kids'$42.73Save 27%compared to $59.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's$92.73Save 28%compared to $130.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Thermal Top - Women's$93.73Save 25%compared to $125.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Kari TraaSval Base Layer Pants - Women's$48.73Save 30%compared to $70.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Helly HansenHH Durawool Crew Long-Sleeve Shirt - Women's$59.73Save 33%compared to $90.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Kari TraaAlma Hood Base Layer Top - Women's$55.73Save 30%compared to $80.00Underwear Weight:UltralightweightSize Type:RegularREI OUTLET
- Arc'teryxRho Insulated 3/4 Base Layer Bottoms - Men'sTop Rated$159.73Save 20%compared to $200.00Underwear Weight:HeavyweightSize Type:Big, RegularREI OUTLET
- Sale Ends May 25Kari TraaRose Capri High-Waist Base Layer Bottoms - Women's$69.99Save 36%compared to $110.00Underwear Weight:HeavyweightSize Type:Regular
- SmartwoolIntraknit Thermal Max Merino Base Layer Pattern Hoodie - Women's$114.73Save 30%compared to $165.00Size Type:RegularREI OUTLET
- Free CountryCloud Knit Crewneck Base Layer Top - Men's$26.73Save 33%compared to $40.00Underwear Weight:LightweightSize Type:Big, RegularREI OUTLET
- Kari TraaSmekker Half-Zip Base Layer Top - Women's$89.73Save 30%compared to $130.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Active Base Layer Bottoms - Men's$81.73Save 25%compared to $110.00Underwear Weight:MidweightSize Type:BigREI OUTLET
- IcebreakerMerino 125 ZoneKnit Long-Sleeve Half-Zip Base Layer Top - Men'sTop Rated$88.73Save 34%compared to $135.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Arc'teryxRho LT Base Layer Bottoms - Men's$79.73Save 20%compared to $100.00Underwear Weight:MidweightSize Type:BigREI OUTLET
- SpraywayEffra Hoody Base Layer Top - Women's$49.73Save 28%compared to $69.95Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Black DiamondSolution 150 Quarter-Zip Hoody - Women's$99.73Save 31%compared to $145.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Men's$84.73Save 26%compared to $115.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- TerramarC-Suite Mammoth Sherpa Fleece Mid-Layer Pants - Men's$56.73Save 29%compared to $80.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Helly HansenLIFA Merino Midweight Balaclava Base Layer Hoodie - Women's$109.73Save 29%compared to $155.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaSmekker Long-Sleeve Base Layer Top - Women's$83.73Save 30%compared to $120.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- RHONEApres Houndstooth Seamless Base Layer Leggings - Women's$88.93Save 30%compared to $128.00Underwear Weight:LightweightSize Type:Regular
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