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- Kari TraaEloise Base Layer Pants - Women's$51.73Save 26%compared to  $70.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- IcebreakerMerino 200 ZoneKnit Long-Sleeve Half-Zip Thermal Base Layer Top - Women's$103.73Save 35%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- 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
- Helly HansenLIFA Merino Midweight 2-In-1 Base Layer Hoodie - Women's$86.73Save 27%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaSval Base Layer Pants - Women's$49.73Save 28%compared to  $70.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- ArtilectBoulder 125 Crew Long-Sleeve Base Layer Top - Women's$65.73Save 45%compared to  $120.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- IcebreakerMerino 260 Tech Thermal Base Layer Leggings With Fly - Men'sTop Rated$93.73Save 25%compared to  $125.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Sale Ends Dec 8IcebreakerMerino 200 Oasis Long-Sleeve Crewe Base Layer Top - Men's$89.99Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:Regular, Big
- Kari TraaFryd Half-Zip Base Layer Top - Women's$48.73Save 26%compared to  $66.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Kari TraaFierce Base Layer Pants - Women's$46.73Save 29%compared to  $66.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Wild RyeJane Leggings - Women's$64.73Save 40%compared to  $109.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- CraftCore Dry Active Comfort Long-Sleeve Base Layer Jersey - Kids'$38.73Save 40%compared to  $64.95Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Sale Ends Dec 8Icebreaker260 Tech Vertex High-Rise Thermal Base Layer Leggings - Women's$112.49Save 25%compared to  $150.00Underwear Weight:HeavyweightSize Type:Regular
- Kari TraaAlma Half-Zip Base Layer Top - Women's$59.73Save 25%compared to  $80.00Underwear Weight:UltralightweightSize Type:RegularREI OUTLET
- IcebreakerMerino Base Layer Leggings - Women's$149.73Save 25%compared to  $200.00Size Type:RegularREI OUTLET
- Kari TraaFierce Long-Sleeve Base Layer Top - Women's$46.73Save 29%compared to  $66.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Sale Ends Dec 8IcebreakerMerino 200 Oasis Long-Sleeve Crewe Base Layer Top - Women's$89.99Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:Regular
- IcebreakerFastray II 20" High-Rise 3/4 Base Layer Tights - Women's$82.73Save 24%compared to  $110.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- ArtilectDarkhorse 185 Zoned Base Layer Leggings - Women's$99.73Save 37%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- ArtilectFlatiron 185 Base Layer Leggings - Women's$93.73Save 41%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Sale Ends Dec 8IcebreakerMerino 200 Oasis Base Layer Leggings - Women's$93.69Save 25%compared to  $125.00Underwear Weight:MidweightSize Type:Regular
- Helly HansenLIFA Merino Midweight Balaclava Hoodie - Women's$106.73Save 28%compared to  $150.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- ArtilectDarkhorse 185 Zoned Crew Base Layer Top - Women's$98.73Save 38%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Helly HansenLifa Merino Midweight Graphic Base Layer Top - Women'sTop Rated$79.73 - $82.73Save 24% - 27%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Helly HansenHH Durawool Crew Long-Sleeve Base Layer Top - Men'sNew arrival$64.73Save 28%compared to  $90.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- Helly HansenLIFA Merino Midweight Balaclava Base Layer Hoodie - Women's$104.73Save 30%compared to  $150.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Helly HansenLIFA ACTIVE Graphic Crew Base Layer Top - Women's$42.73Save 34%compared to  $65.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Icebreaker200 ZoneKnit Thermal Base Layer Leggings - Women'sTop Rated$109.73Save 26%compared to  $150.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Women's$84.73Save 26%compared to  $115.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- ArtilectDarkhorse 185 Zoned Quarter-Zip Base Layer Top - Women's$116.73Save 31%compared to  $170.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
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