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- IcebreakerMerino 260 Tech Thermal Base Layer Leggings - Women'sTop Rated$93.73Save 25%compared to  $125.00Underwear Weight:HeavyweightSize Type:PlusREI OUTLET
- Terramar3.0 Thermawool Half-Zip Base Layer Top - Women's$56.73Save 24%compared to  $75.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- PatagoniaCapilene Thermal Weight Long Underwear Bottoms - Women's$99.00Underwear Weight:HeavyweightSize Type:Regular
- SmartwoolClassic Thermal Merino Lettuce Edge Crew Base Layer Top - Women's$82.73Save 28%compared to  $115.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaEloise Base Layer Pants - Women'sNew arrival$52.73Save 24%compared to  $70.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Lettuce Edge Base Layer Bottoms - Women's$82.73Save 28%compared to  $115.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- PatagoniaCapilene Midweight Base Layer Bottoms - Kids'$18.83Save 51%compared to  $39.00Underwear Weight:MidweightSize Type:Regular
- SpraywayEffra Jacket Base Layer Top - Women's$42.73Save 34%compared to  $64.95Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- BurtonMidweight Base Layer Pants - Women's$19.83Save 69%compared to  $64.95Underwear Weight:MidweightSize Type:Regular
- Terramar2.0 Cloud Nine Midweight Base Layer Capri Pants - Women's$28.73Save 28%compared to  $40.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaSara Long-Sleeve Base Layer Top - Women'sNew arrival$74.73Save 25%compared to  $100.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- IcebreakerMerino 200 Oasis Thermal Leggings - Women's$105.00Underwear Weight:MidweightSize Type:Regular, Plus
- PatagoniaCapilene Thermal Weight Zip-Neck Long Underwear Top - Women's$109.00Underwear Weight:HeavyweightSize Type:Regular
- Kari TraaLucie Half-Zip Base Layer Top - Women's$67.73Save 24%compared to  $90.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's$130.00Underwear Weight:LightweightSize Type:Regular
- Arc'teryxLana Merino Wool Base Layer Tank Top - Women's$59.93Save 33%compared to  $90.00Underwear Weight:LightweightSize Type:Regular
- SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's Plus Sizes$115.00 - $120.00Underwear Weight:MidweightSize Type:Plus
- SpraywayEffra Leggings Base Layer Bottoms - Women's$36.73Save 26%compared to  $49.95Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Black DiamondSolution 150 Merino Base Layer Crew Top - Women'sTop Rated$99.73Save 26%compared to  $135.00Underwear Weight:LightweightSize 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
- IcebreakerMerino 260 Vertex Long-Sleeve Crewe Thermal Base Layer Top - Women's$99.73Save 28%compared to  $140.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women'sTop Rated$78.73Save 25%compared to  $105.00Size Type:Regular, PlusREI OUTLET
- SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Kids'$51.73Save 26%compared to  $70.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino Base Layer Leggings - Women's$149.73Save 25%compared to  $200.00Size Type:RegularREI OUTLET
- Terramar3.0 Thermawool Base Layer Tights - Women's$52.73Save 24%compared to  $70.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Helly HansenLIFA Merino Midweight Graphic Base Layer Pants - Women's$79.73Save 27%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- CraftCore Dry Active Comfort Base Layer Pants - Women's$29.73Save 33%compared to  $44.95Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Women's$95.00Size Type:Regular
- Free CountryForce Grid Fleece Base Layer Bottoms - Women's$34.73Save 36%compared to  $55.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Kari TraaFryd Base Layer Pants - Women's$29.83 - $65.00Underwear Weight:MidweightSize Type:Regular
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