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- HalfdaysJohnson Base Layer Top - Women's$95.00Underwear Weight:UltralightweightSize Type:Regular
- IcebreakerMerino 200 Oasis Base Layer Leggings - Women's$125.00Underwear Weight:MidweightSize Type:Regular
- Helly HansenLifa Merino Midweight Crew Base Layer Top - Men's$105.00Underwear Weight:MidweightSize Type:Regular, Big
- Terramar3.0 Thermawool Half-Zip Base Layer Top - Women's$56.73Save 24%compared to  $75.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Thermal Merino Base Layer Hoodie - Women's$180.00Underwear Weight:MidweightSize Type:Regular
- SmartwoolClassic Thermal Merino Mock Neck Base Layer Top - Women's$140.00Underwear Weight:MidweightSize Type:Regular
- TerramarC-Suite Mammoth Sherpa Fleece Mid-Layer Joggers - Women's$51.73Save 35%compared to  $80.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino 260 ZoneKnit Long-Sleeve Half-Zip Base Layer Top - Men's$185.00Underwear Weight:HeavyweightSize Type:Regular, Big
- IcebreakerMerino 260 Vertex Long-Sleeve Crewe Natural Shades Base Layer Top - Women's$104.73Save 25%compared to  $140.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Hot ChillysPeach Skins T-Neck Base Layer Top - Kids'$32.73Save 34%compared to  $50.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes$89.95Underwear Weight:LightweightSize Type:Plus
- Free CountryMicrotech Heat Cocarber Base Layer Top - Women's$34.73Save 30%compared to  $50.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Kari TraaSmekker Base Layer Pants - Women's$83.73Save 30%compared to  $120.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- REI Co-opMerino 185 Base Layer Top - Women's Plus Sizes$69.95Underwear Weight:LightweightSize Type:Plus
- Kari TraaVilma Base Layer Pants - Women's$66.73Save 25%compared to  $90.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- TerramarC-Suite Fusion Thermal Pants - Women's$42.73Save 34%compared to  $65.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaSmekker High-Waist Base Layer Pants - Women's$130.00Underwear Weight:MidweightSize Type:Regular
- Arms of Andes300 Alpaca Wool Long-Sleeve Crew Base Layer Top - Men's$130.00 - $140.00Underwear Weight:LightweightSize Type:Regular, Big
- Ortovox185 Rock'N'Wool Short Base Layer Pants - Men's$100.00 - $110.00Underwear Weight:LightweightSize Type:Regular, Big
- Icebreaker200 Oasis Base Layer Leggings - Kids'$60.00Underwear Weight:MidweightSize Type:Regular
- Icebreaker200 ZoneKnit Merino Thermal Base Layer Leggings - Men's$109.73Save 26%compared to  $150.00Size Type:Regular, BigREI OUTLET
- Deux par DeuxThermal Underwear Base Layer Set - Kids'$72.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaFryd Base Layer Top - Women's$65.00Underwear Weight:MidweightSize Type:Regular
- Ortovox120 Comp Light Base Layer Hoody - Men's$120.00Underwear Weight:LightweightSize Type:Regular, Big
- Kari TraaEloise Long-Sleeve Base Layer Top - Women's$51.73Save 26%compared to  $70.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women'sTop Rated$78.73Save 25%compared to  $105.00Size Type:PlusREI OUTLET
- Helly HansenLIFA Merino Midweight Base Layer Hoodie - Men's$125.00Underwear Weight:MidweightSize Type:Regular, Big
- IcebreakerMerino Base Layer Leggings - Women's$149.73Save 25%compared to  $200.00Size Type:RegularREI OUTLET
- Kari TraaRose High-Waist Base Layer Pants - Women's$79.73Save 27%compared to  $110.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- IcebreakerMerino 200 Oasis Long-Sleeve Crewe Base Layer Top - Women's$120.00Underwear Weight:MidweightSize Type:Regular
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