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- TerramarC-Suite Mammoth Sherpa Fleece Mid-Layer Joggers - Women's$56.73Save 29%compared to  $80.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Men's$84.73Save 26%compared to  $115.00Underwear Weight:LightweightSize Type:Regular, BigREI 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
- Helly HansenMerino Wool Base Layer Set - Kids'$75.73Save 36%compared to  $120.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- ArtilectDarkhorse 185 Zoned Crew Base Layer Top - Women's$109.73Save 31%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- PatagoniaCapilene Midweight Base Layer Bottoms - Infants'$21.73Save 25%compared to  $29.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Thermal Max Merino Base Layer Pattern Hoodie - Women's$123.73Save 25%compared to  $165.00Size Type:RegularREI OUTLET
- IcebreakerMerino 200 ZoneKnit Long-Sleeve Half-Zip Thermal Base Layer Top - Women's$119.73Save 25%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaLucie Base Layer Pants - Women's$59.73Save 25%compared to  $80.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- SpraywayEffra Crew Base Layer Top - Women's$36.73Save 26%compared to  $49.95Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- IcebreakerMerino 125 ZoneKnit Long-Sleeve Half-Zip Base Layer Top - Men'sTop Rated$99.73Save 26%compared to  $135.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- SpraywayEffra Hoody Base Layer Top - Women's$49.73Save 28%compared to  $69.95Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- SmartwoolIntraknit Thermal Merino Base Layer Colorblock Crew - Men's$96.73Save 25%compared to  $130.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Kari TraaSmekker Long-Sleeve Base Layer Top - Women's$89.73Save 25%compared to  $120.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Kari TraaLucie Half-Zip Base Layer Top - Women's$67.73Save 24%compared to  $90.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Arc'teryxKyanite Base Layer Crew Top - Women's$72.83Save 39%compared to  $120.00Underwear Weight:HeavyweightSize Type:Regular
- ArtilectDarkhorse 185 Zoned Quarter-Zip Base Layer Top - Women's$116.73Save 31%compared to  $170.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Free CountryCloud Knit Base Layer Bottoms - Women's$31.73Save 29%compared to  $45.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Helly HansenVerglas Half-Zip Top - Women's$63.73Save 25%compared to  $85.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- SpraywayEffra Leggings Base Layer Bottoms - Women's$36.73Save 26%compared to  $49.95Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Arc'teryxRho Hybrid Insulated Base Layer Bottoms - Women'sNew arrival$145.73Save 19%compared to  $180.00Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- Arc'teryxRho Boot Cut Base Layer Bottoms - Women'sNew arrival$72.73Save 19%compared to  $90.00Underwear 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
- SaxxRoast Master Midweight Base Layer Bottoms - Men's$52.73Save 29%compared to  $75.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- SaxxRoast Master Midweight Long-Sleeve Crew Base Layer Top - Men's$52.73Save 29%compared to  $75.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Thermal Top - Women's$93.73Save 25%compared to  $125.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Icebreaker125 ZoneKnit Thermal Base Layer Leggings - Women's$93.73Save 25%compared to  $125.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Helly HansenLIFA Merino Midweight Balaclava Base Layer Hoodie - Women's$104.73Save 30%compared to  $150.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Helly HansenLIFA ACTIVE Graphic Crew Base Layer Top - Women's$46.73Save 28%compared to  $65.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- ArtilectFlatiron 185 Base Layer Leggings - Women's$109.73Save 31%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
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