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- Free CountryMicrotech Heat Cocaber Base Layer Top - Men's$21.73Save 45%compared to  $40.00Underwear Weight:LightweightSize Type:BigREI OUTLET
- SpraywayEffra Hoody Base Layer Top - Women's$49.73Save 28%compared to  $69.95Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- Free CountryCloud Knit Base Layer Bottoms - Women's$31.73Save 29%compared to  $45.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Free CountryMicrotech Heat Base Layer Bottoms - Men's$31.73Save 29%compared to  $45.00Underwear Weight:LightweightSize Type:BigREI OUTLET
- Mountain HardwearMountain Stretch Base Layer Tights - Men's$46.73Save 37%compared to  $75.00Underwear Weight:MidweightSize Type:BigREI OUTLET
- Icebreaker260 ZoneKnit Base Layer Leggings - Men'sTop Rated$119.73Save 27%compared to  $165.00Underwear Weight:HeavyweightSize Type:BigREI OUTLET
- Free CountryForce Grid Fleece Crew Base Layer Top - Men'sTop Rated$26.73Save 40%compared to  $45.00Underwear Weight:LightweightSize Type:BigREI OUTLET
- Free CountryMicrotech Heat Base Layer Top - Men's$28.73Save 36%compared to  $45.00Underwear Weight:LightweightSize Type:BigREI OUTLET
- Arc'teryxRho Merino Wool Base Layer Bottoms - Men's$96.93Save 19%compared to  $120.00Underwear Weight:LightweightSize Type:Big
- ArtilectFlatiron 185 Base Layer Leggings - Men's$99.73Save 37%compared to  $160.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- SeirusHeatwave Body Mapped Quarter-Zip Long-Sleeve Base Layer Top - Women's$69.83Save 50%compared to  $140.00Underwear Weight:MidweightSize Type:Regular
- SmartwoolIntraknit Thermal Merino Pattern Crew Base Layer Top - Men's$75.73Save 41%compared to  $130.00Underwear Weight:LightweightSize Type:Big, RegularREI OUTLET
- Free CountryMicrotech Heat Cocaber Base Layer Top - Women's$34.73Save 30%compared to  $50.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- CraftCORE Dry Active Comfort Base Layer Top - Men's$39.73Save 38%compared to  $64.95Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- SpraywayEffra Jacket Base Layer Top - Women's$46.73Save 28%compared to  $64.95Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- Sweaty BettyHigh-Neck Jacquard Base Layer Top - Women'sTop Rated$82.73Save 29%compared to  $118.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- ArtilectGoldhill 125 Zoned Crew Base Layer Top - Men's$79.73Save 38%compared to  $130.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- Terramar3.0 Thermawool Half-Zip Base Layer Top - Women's$56.73Save 24%compared to  $75.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Terramar3.0 Thermawool Base Layer Tights - Women's$52.73Save 24%compared to  $70.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Arc'teryxRho Hoody Base Layer Top - Women'sTop Rated$104.93Save 19%compared to  $130.00Underwear Weight:LightweightSize Type:Regular
- SeirusHeatwave All Season Reversible Long-Sleeve Base Layer Top - Women's$36.83Save 50%compared to  $75.00Underwear Weight:LightweightSize Type:Regular
- ArtilectDarkhorse 185 Zoned Crew Base Layer Top - Men'sTop Rated$109.73Save 31%compared to  $160.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Terramar2.0 Cloud Nine Midweight Performance Base Layer Scoop Shirt - Women's$29.73Save 33%compared to  $45.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SpraywayEffra Leggings Base Layer Bottoms - Women's$36.73Save 26%compared to  $49.95Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- Helly HansenLifa Active Base Layer Bottoms - Women's$39.73Save 27%compared to  $55.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Sale Ends Jul 3Helly HansenVerglas Half-Zip Top - Women's$39.73Save 53%compared to  $85.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Sale Ends Jul 3Wild RyeJane Leggings - Women's$49.73Save 54%compared to  $109.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- ArtilectFlatiron 185 Crew Base Layer Top - Men's$96.73 - $109.73Save 30% - 31%compared to  $140.00 - $160.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Picture Organic ClothingNangha Base Layer Top - Men's$44.83Save 50%compared to  $90.00Underwear Weight:MidweightSize Type:Regular, Big
- Helly HansenLIFA Merino Midweight 2-In-1 Graphic Half-Zip Base Layer Top - Women's$86.73 - $89.73Save 25% - 27%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
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