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- 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
- Sale Ends Dec 1SmartwoolClassic Thermal Merino Base Layer Crew One-Piece - Women's$187.49Save 25%compared to  $250.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaAlma Hood Base Layer Top - Women's$59.73Save 25%compared to  $80.00Underwear Weight:UltralightweightSize 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 Nov 24Kari TraaAnna High-Waist Base Layer Pants - Women's$82.49Save 25%compared to  $110.00Underwear Weight:MidweightSize Type:Regular
- Sale Ends Dec 1SmartwoolIntraknit Merino 3/4 Base Layer Bottoms - Women's$89.99Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:Regular
- Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Thermal Top - Women's$93.73Save 25%compared to  $125.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Sweaty BettyHigh-Neck Jacquard Base Layer Top - Women'sTop Rated$69.73Save 40%compared to  $118.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$101.19Save 25%compared to  $135.00Underwear Weight:MidweightSize Type:Regular, Plus
- Helly HansenLIFA Merino Midweight Balaclava Base Layer Hoodie - Women's$104.73Save 30%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
- 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
- Icebreaker200 Oasis Sonebula Long-Sleeve Crewe Base Layer Top - Women's$89.73Save 25%compared to  $120.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Kari TraaAlma Half-Zip Base Layer Top - Women's$59.73Save 25%compared to  $80.00Underwear Weight:UltralightweightSize Type:RegularREI OUTLET
- ArtilectFlatiron 185 Quarter-Zip Base Layer Top - Women's$87.73Save 45%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaFryd Base Layer Pants - Women's$40.73Save 32%compared to  $60.00Underwear 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
- ArtilectFlatiron 185 Base Layer Leggings - Women's$93.73Save 41%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Sale Ends Nov 24Kari TraaAnna Half-Zip Base Layer Top - Women's$89.99Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:Regular
- Sale Ends Nov 24Icebreaker200 Oasis Base Layer Leggings - Kids'$44.99Save 25%compared to  $60.00Underwear Weight:MidweightSize Type:Regular
- Sale Ends Nov 24Kari TraaAnna Long-Sleeve Base Layer Top - Women's$82.49Save 25%compared to  $110.00Underwear Weight:MidweightSize Type:Regular
- Sale Ends Nov 24Kari TraaSmekker High-Waist Base Layer Pants - Women's$97.49Save 25%compared to  $130.00Underwear Weight:MidweightSize Type:Regular
- ArtilectDarkhorse 185 Zoned Quarter-Zip Base Layer Top - Women's$116.73Save 31%compared to  $170.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaRose Light Capri Base Layer Pants - Women's$74.73Save 25%compared to  $100.00Underwear Weight:MidweightSize 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
- Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Women's$84.73Save 26%compared to  $115.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Sale Ends Nov 24Icebreaker125 Cool-Lite Merino Blend Sphere III Scoop T-Shirt - Women's$56.19Save 25%compared to  $75.00Underwear Weight:LightweightSize 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
- Icebreaker200 Oasis Sonebula Base Layer Leggings - Women's$89.73Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Icebreaker125 ZoneKnit Thermal Base Layer Leggings - Women's$86.73Save 30%compared to  $125.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
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