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- Kari TraaFierce Long-Sleeve Base Layer Top - Women's$46.73Save 29%compared to  $66.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- TerramarC-Suite Mammoth Sherpa Fleece Mid-Layer Joggers - Women's$51.73Save 35%compared to  $80.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Turtleneck Base Layer - Men'sTop Rated$135.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaSmekker Long-Sleeve Base Layer Top - Women's$89.73Save 25%compared to  $120.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Helly HansenLIFA Merino Midweight Graphic Base Layer Crew Top - Women's$54.83 - $115.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaRose Light Capri Base Layer Pants - Women's$74.73Save 25%compared to  $100.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Helly HansenLIFA Merino Midweight Balaclava Base Layer Hoodie - Women's$104.73Save 30%compared to  $150.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Free CountryMicrotech Heat Cocarber Base Layer Top - Women'sTop Rated$39.73Save 33%compared to  $60.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Kari TraaFryd Base Layer Pants - Women's$40.73Save 32%compared to  $60.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- KUHLReactiv Lite Grid Quarter-Zip Base Layer Top - Women'sTop Rated$58.83Save 50%compared to  $119.00Underwear Weight:LightweightSize Type:Regular
- Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$115.00 - $130.00Underwear Weight:LightweightSize Type:Regular, Plus
- Sale Ends TodayArtilectDarkhorse 185 Zoned Quarter-Zip Base Layer Top - Women's$66.73Save 60%compared to  $170.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaAlma Hood Base Layer Top - Women's$59.73Save 25%compared to  $80.00Underwear Weight:UltralightweightSize Type:RegularREI OUTLET
- Kari TraaFryd Long-Sleeve Base Layer Top - Women's$49.73Save 23%compared to  $65.00Underwear Weight:LightweightSize Type:Plus, RegularREI OUTLET
- CraftCore Dry Active Comfort Base Layer Pants - Men's$32.73Save 34%compared to  $49.95Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Merino 3/4 Base Layer Bottoms - Women's$71.83Save 40%compared to  $120.00Underwear Weight:MidweightSize Type:Regular
- Helly HansenLIFA Base Layer Pants - Men's$45.00Underwear Weight:LightweightSize Type:Regular, Big
- Black DiamondSolution 150 Merino Base Layer Bottoms - Women'sTop Rated$79.73Save 27%compared to  $110.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Wild RyeBassett LITE Base Layer Leggings - Women's$43.83Save 50%compared to  $89.00Underwear Weight:LightweightSize Type:Regular, Plus
- ArtilectBoulder 125 Crew Long-Sleeve Base Layer Top - Women's$65.73Save 45%compared to  $120.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Helly HansenLIFA Merino Midweight Graphic Base Layer Pants - Women's$56.83Save 50%compared to  $115.00Underwear Weight:MidweightSize Type:Regular
- Helly HansenLifa Merino Midweight Base Layer Half-Zip Top - Women's$110.00Underwear Weight:MidweightSize Type:Regular
- Helly HansenHH LIFA Crew Base Layer Top - Women's$50.00Underwear Weight:LightweightSize Type:Regular
- Icebreaker125 ZoneKnit Merino Thermal Leggings - Men's$93.73Save 25%compared to  $125.00Underwear Weight:UltralightweightSize Type:RegularREI OUTLET
- Kari TraaLucie Half-Zip Base Layer Top - Women's$66.73Save 25%compared to  $90.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Kari TraaEmbla Wool Base Layer T-Shirt - Women's$80.00Underwear Weight:UltralightweightSize Type:Regular
- RHONEApres Houndstooth Quarter-Zip Base Layer Top - Women's$102.93Save 30%compared to  $148.00Underwear Weight:LightweightSize Type:Regular
- BurtonMidweight X Base Layer Pants - Women's$36.83Save 50%compared to  $74.95Underwear Weight:MidweightSize Type:Regular
- ArtilectFlatiron 185 Base Layer Leggings - Women's$76.73Save 52%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaVoss Cashmere Mix Half-Zip Base Layer Top - Women's$116.73Save 35%compared to  $180.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
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