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- The North FaceSummit Series Pro 120 Crew Base Layer Top - Women'sTop Rated$90.00Underwear Weight:UltralightweightSize Type:Regular, Plus
- Terramar2.0 Cloud Nine Midweight Base Layer Capri Pants - Women's$28.73Save 28%compared to  $40.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Ortovox185 Rock'N'Wool Long-Sleeve Base Layer Top - Men's$120.00 - $130.00Underwear Weight:LightweightSize Type:Regular, Big
- PatagoniaCapilene Thermal Weight Boot-Length Long Underwear Bottoms - Women's$85.00Underwear Weight:HeavyweightSize Type:Regular
- HalfdaysFay Midweight Merino Base Layer Top - Women'sTop Rated$130.00Underwear Weight:MidweightSize Type:Regular
- Outdoor ResearchAlpine Onset Merino 150 Base Layer Bottoms - Men's$99.00Underwear Weight:LightweightSize Type:Regular, Big
- SpraywayEffra Leggings Base Layer Bottoms - Women's$36.73Save 26%compared to  $49.95Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Kari TraaFryd Base Layer Pants - Women's$42.73Save 22% - 28%compared to  $55.00 - $60.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Deux par DeuxThermal Underwear Base Layer Set - Kids'$72.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaEdith Base Layer Pants - Women's$74.73Save 25%compared to  $100.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaFryd Base Layer Top - Women's$65.00Underwear Weight:MidweightSize Type:Regular
- Arc'teryxLana Merino Wool Base Layer Tank Top - Women'sNew arrival$64.73Save 19%compared to  $80.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- TerramarC-Suite Mammoth Sherpa Fleece Mid-Layer Pants - Men's$56.73Save 29%compared to  $80.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Arc'teryxRho Hybrid Insulated Base Layer Bottoms - Women'sTop Rated$180.00Underwear Weight:HeavyweightSize Type:Regular, Plus
- Kari TraaSmekker Base Layer Pants - Women's$83.73Save 30%compared to  $120.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Icebreaker260 Tech Base Layer Leggings - Women's$125.00Underwear Weight:HeavyweightSize Type:Regular, Plus
- ColumbiaOmni-Heat Midweight Crew Base Layer Top - Kids'Top Rated$30.00Underwear Weight:MidweightSize Type:Regular
- PatagoniaCapilene Thermal Weight Long Underwear Crew Top - Women's$99.00Underwear Weight:HeavyweightSize Type:Regular
- ColumbiaMidweight Stretch Long-Sleeve Base Layer Top - Women'sTop Rated$55.00Underwear Weight:MidweightSize Type:Regular, Plus
- Helly HansenLIFA Merino Midweight 2-In-1 Graphic Half-Zip Base Layer Top - Women's$86.73Save 27%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Men's$84.73Save 26%compared to  $115.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- Wild RyeJane Leggings - Women's$64.73Save 40%compared to  $109.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Hot ChillysPeach Skins Crew Base Layer Top- Kids'$29.73Save 33%compared to  $45.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- SpraywayEffra Hoody Base Layer Top - Women's$49.73Save 28%compared to  $69.95Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Kari TraaMina Base Layer Pants - Women's$42.73Save 28%compared to  $60.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Arc'teryxRho Merino Wool Base Layer Bottoms - Men's$120.00Underwear Weight:LightweightSize Type:Regular, Big
- IcebreakerMerino 260 Tech Long Sleeve Crewe Base Layer Top - Men'sTop Rated$119.73Save 27%compared to  $165.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Icebreaker260 Tech Long-Sleeve Crewe Base Layer Top - Women'sTop Rated$125.00Underwear Weight:HeavyweightSize Type:Regular, Plus
- Kari TraaEdith Long-Sleeve Base Layer Top - Women's$74.73Save 25%compared to  $100.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Icebreaker200 ZoneKnit Long-Sleeve Crewe Base Layer Thermal Top - Men'sTop Rated$109.73Save 26%compared to  $150.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
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