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- CraftActive Intensity Zip Base Layer Top - Women's$54.73Save 31%compared to  $79.95Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Helly HansenLIFA Merino Midweight Graphic Base Layer Pants - Women's$81.93Save 25%compared to  $110.00Underwear Weight:MidweightSize Type:Regular
- SmartwoolIntraknit Active Base Layer Crew Shirt - Women's$76.73Save 30%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Helly HansenLifa Merino Midweight Base Layer Pants - Women's$74.93Save 25%compared to  $100.00Underwear Weight:MidweightSize Type:Plus
- Helly HansenOdin Power Stretch Half-Zip Base Layer Top - Women's$88.73Save 40%compared to  $150.00Underwear Weight:MidweightSize 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
- Helly HansenLIFA Merino Midweight 2-In-1 Base Layer Hoodie - Men's$89.73Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:BigREI OUTLET
- BurtonMidweight X Base Layer Long Neck Hoodie - Women'sTop Rated$44.83Save 50%compared to  $89.95Underwear Weight:MidweightSize Type:Regular
- CraftCORE Wool Mix Base Layer Set - Women's$89.73Save 35%compared to  $139.95Size Type:RegularREI OUTLET
- Kari TraaSmekker Long-Sleeve Base Layer Top - Women's$89.73Save 25%compared to  $120.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Icebreaker260 Tech Long-Sleeve Crewe Base Layer Top - Women'sTop Rated$39.83 - $125.00Underwear Weight:HeavyweightSize Type:Regular, Plus
- SmartwoolClassic Thermal Merino Base Layer Bottoms - Kids'Top Rated$48.73Save 25%compared to  $65.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- PatagoniaCapilene Midweight Base Layer Bottoms - Kids'$26.93Save 30%compared to  $39.00Underwear Weight:MidweightSize Type:Regular
- PatagoniaCapilene Midweight Crew Base Layer Top - Kids'$26.93Save 30%compared to  $39.00Underwear Weight:MidweightSize Type:Regular
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'$44.73Save 31%compared to  $65.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Helly HansenGraphic Lifa Merino Base Layer Set - Kids'$74.73Save 32%compared to  $110.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- IcebreakerMerino 200 Oasis Thermal Base Layer Leggings - Women's$78.73Save 25%compared to  $105.00Underwear Weight:MidweightSize Type:Regular, PlusREI OUTLET
- Kari TraaFryd Base Layer Pants - Women's$44.73Save 25%compared to  $60.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- IcebreakerMerino 260 Tech Thermal Base Layer Leggings - Women'sTop Rated$93.73Save 25%compared to  $125.00Underwear Weight:HeavyweightSize Type:PlusREI OUTLET
- Helly HansenMerino Wool Base Layer Set - Kids'$75.73Save 36%compared to  $120.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Kari TraaMina Long-Sleeve Base Layer Top - Women's$44.73Save 25%compared to  $60.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Kari TraaFaith Base Layer Pants - Women's$39.83Save 63%compared to  $110.00Underwear Weight:HeavyweightSize Type:Regular
- Kari TraaLune Long-Sleeve Base Layer Top - Women's$41.73Save 35%compared to  $65.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Kids'$51.73Save 26%compared to  $70.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Thermal Top - Women's$93.73Save 25%compared to  $125.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Kari TraaAlma Hood Base Layer Top - Women's$59.73Save 25%compared to  $80.00Underwear Weight:UltralightweightSize Type:RegularREI OUTLET
- Kari TraaRose Base Layer Hoodie - Women's$97.73Save 24%compared to  $130.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Icebreaker200 Oasis Sonebula Base Layer Leggings - Women's$89.73Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaAlma Half-Zip Base Layer Top - Women's$59.73Save 25%compared to  $80.00Underwear Weight:UltralightweightSize Type:RegularREI OUTLET
- IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men'sTop Rated$78.73Save 25%compared to  $105.00Underwear Weight:LightweightSize Type:Big, RegularREI OUTLET
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