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- Icebreaker200 ZoneKnit Long-Sleeve Crewe Base Layer Top - Women's$104.93 - $150.00Underwear Weight:MidweightSize Type:Regular
- Helly HansenLIFA Merino Midweight Balaclava Hoodie - Women's$106.73Save 28%compared to  $150.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Arms of Andes160 Ultralight Alpaca Wool Crew Neck Base Layer T-Shirt - Women's$55.93Save 25%compared to  $75.00Underwear Weight:UltralightweightSize Type:Regular
- Kari TraaEloise Half-Zip Base Layer Top - Women's$59.73Save 25%compared to  $80.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Deux par DeuxThermal Underwear Base Layer Set - Kids'$49.93Save 30%compared to  $72.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaVilma Base Layer Pants - Women's$66.73Save 25%compared to  $90.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Arms of Andes300 Lightweight Alpaca Wool Base Layer Leggings - Women'sTop Rated$77.93Save 25%compared to  $105.00Underwear Weight:LightweightSize Type:Regular
- IcebreakerMerino 200 Oasis Long-Sleeve Crewe Base Layer Top - Women's$89.93 - $120.00Underwear Weight:MidweightSize Type:Regular
- Icebreaker260 Tech Vertex High-Rise Thermal Base Layer Leggings - Women's$99.93Save 33%compared to  $150.00Underwear Weight:HeavyweightSize Type:Regular
- Kari TraaLucie Half-Zip Base Layer Top - Women's$66.73Save 25%compared to  $90.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Kari TraaEloise Base Layer Pants - Women's$51.73Save 26%compared to  $70.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Icebreaker260 Tech Vertex Long-Sleeve Half-Zip Thermal Base Layer Top - Women's$99.93Save 33%compared to  $150.00Underwear Weight:HeavyweightSize Type:Regular
- CraftCore Dry Active Comfort Long-Sleeve Base Layer Jersey - Kids'$38.73Save 40%compared to  $64.95Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerFastray II 20" High-Rise 3/4 Base Layer Tights - Women's$82.73Save 24%compared to  $110.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Black DiamondSolution 150 Merino Base Layer Bottoms - Women'sTop Rated$79.73Save 27%compared to  $110.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Arms of Andes160 Ultralight Alpaca Wool Long-Sleeve Base Layer Shirt - Women's$62.93 - $74.93Save 25%compared to  $85.00 - $100.00Underwear Weight:UltralightweightSize Type:Regular
- Arms of Andes300 Lightweight Alpaca Wool Pullover Base Layer Hoodie - Women's$104.93Save 25%compared to  $140.00Underwear Weight:LightweightSize Type:Regular
- Helly HansenVerglas Half-Zip Top - Women's$63.73Save 25%compared to  $85.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Arms of Andes300 Lightweight Alpaca Wool Half-Zip Base Layer Top - Women's$85.93 - $100.93Save 25%compared to  $115.00 - $135.00Underwear Weight:LightweightSize Type:Regular
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Kids'Top Rated$52.73Save 29%compared to  $75.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerSiren Long-Sleeve Sweetheart Base Layer Shirt - Women's$62.73Save 26%compared to  $85.00Underwear 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
- Outdoor ResearchAlpine Onset Merino 150 Crew Base Layer Top - Women's$69.93Save 29%compared to  $99.00Underwear Weight:LightweightSize Type:Regular
151–173 of 173 products
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