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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
- Free CountryMicrotech Heat Cocaber Base Layer Top - Men's$26.73Save 33%compared to  $40.00Underwear Weight:LightweightSize Type:BigREI OUTLET
- Free CountryMicrotech Heat Base Layer Bottoms - Men's$31.73Save 29%compared to  $45.00Underwear Weight:LightweightSize Type:BigREI OUTLET
- Free CountryForce Grid Fleece Base Layer Top - Men's$29.73Save 33%compared to  $45.00Underwear Weight:LightweightSize Type:BigREI OUTLET
- Mountain HardwearMountain Stretch Base Layer Tights - Men's$55.73Save 25%compared to  $75.00Underwear Weight:MidweightSize Type:BigREI OUTLET
- Free CountryMicrotech Heat Base Layer Top - Men's$28.73Save 36%compared to  $45.00Underwear Weight:LightweightSize Type:BigREI OUTLET
- Kari TraaFryd Base Layer Pants - Women's$37.73Save 31%compared to  $55.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Sale Ends May 26Kari TraaLune Long-Sleeve Base Layer Top - Women's$44.73Save 31%compared to  $65.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Kari TraaKlara High-Waisted Base Layer Pants - Women's$62.73Save 30%compared to  $90.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Helly HansenLifa Active Base Layer Bottoms - Women's$39.73Save 27%compared to  $55.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Kari TraaFierce Base Layer Pants - Women's$39.73Save 33%compared to  $60.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Free CountryForce Grid Fleece Crew Base Layer Top - Men'sTop Rated$31.73Save 29%compared to  $45.00Underwear Weight:LightweightSize Type:BigREI OUTLET
- tasc PerformanceElevation Merino T-Shirt - Men's$49.73Save 37%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- SmartwoolClassic Thermal Merino Lettuce Edge Crew Base Layer Top - Women's$82.73Save 28%compared to  $115.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Thermal Max Merino Base Layer Bottoms - Women's$100.73Save 25%compared to  $135.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Sale Ends May 26Kari TraaFloke Base Layer Pants - Women's$69.73Save 30%compared to  $100.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- CotopaxiLiso Base Layer Top - Men'sTop Rated$48.73Save 25%compared to  $65.00Underwear Weight:MidweightSize Type:BigREI OUTLET
- CraftActive Intensity Base Layer Pants - Men's$36.73Save 33%compared to  $54.95Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- ArtilectGoldhill 125 Zoned Crew Base Layer Top - Men's$89.73Save 30%compared to  $130.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- Free CountryForce Grid Fleece Base Layer Bottoms - Women's$34.73Save 36%compared to  $55.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Sale Ends May 26Kari TraaRose Light Half-Zip Base Layer Top - Women's$83.73Save 30%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Terramar2.0 Ultra Merino Turtleneck Base Layer Top - Women's$52.73Save 29%compared to  $75.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Terramar2.0 Cloud Nine Midweight Performance Base Layer Scoop Shirt - Women's$33.73Save 25%compared to  $45.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Sale Ends May 26Kari TraaMalia Long-Sleeve Base Layer Top - Women's$48.73Save 30%compared to  $70.00Underwear Weight:MidweightSize Type:Regular, PlusREI OUTLET
- Free CountryForce Grid Fleece Base Layer Top - Women's$34.73Save 36%compared to  $55.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Terramar2.0 Cloud Nine Midweight Performance Thermal Turtleneck - Women's$35.73Save 25%compared to  $48.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Sale Ends May 26Kari TraaVoss Cashmere Mix Half-Zip Base Layer Top - Women's$125.73Save 30%compared to  $180.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- tasc PerformanceElevation Merino Base Layer Bottoms - Women's$49.73Save 37%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Helly HansenLIFA Merino Midweight 2-In-1 Base Layer Pants - Women's$74.73Save 25%compared to  $100.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino 200 Sonebula Long-Sleeve High-Neck Base Layer Top - Men's$93.73Save 25%compared to  $125.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
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