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- TerramarC-Suite Mammoth Sherpa Fleece Mid-Layer Joggers - Women's$51.73Save 35%compared to  $80.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men'sTop Rated$78.73Save 25%compared to  $105.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Arc'teryxLana Merino Wool Base Layer Tank Top - Women's$64.73Save 19%compared to  $80.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Kari TraaSmekker Long-Sleeve Base Layer Top - Women's$89.73Save 25%compared to  $120.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Hot ChillysOriginals Solid Base Layer Crew - Kids'$34.73Save 26%compared to  $47.50Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaFryd Base Layer Top - Women's$44.93 - $60.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaAnna Half-Zip Base Layer Top - Women's$83.93 - $120.00Underwear Weight:MidweightSize Type:Regular
- Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Women's$84.73Save 26%compared to  $115.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Kari TraaRose Light Base Layer Top - Women's$81.73Save 25%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Base Layer Quarter-Zip Top - Kids'$51.93 - $70.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaKaia Base Layer Set - Women's$90.93Save 30%compared to  $130.00Underwear Weight:LightweightSize Type:Regular
- Arc'teryxRho Merino Wool Base Layer Bottoms - Men's$120.00Underwear Weight:LightweightSize Type:Big
- Kari TraaRose Half-Zip Base Layer Top - Women'sTop Rated$89.73Save 25%compared to  $120.00Underwear Weight:HeavyweightSize Type:PlusREI OUTLET
- The North FaceFD Pro 160 Base Layer Tights - Women's$48.93Save 30%compared to  $70.00Underwear Weight:MidweightSize Type:Plus
- CraftCORE Dry Active Comfort Base Layer Top - Women's$39.73Save 38%compared to  $64.95Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Women'sTop Rated$99.73Save 26%compared to  $135.00Underwear Weight:HeavyweightSize Type:PlusREI OUTLET
- IcebreakerMerino 200 ZoneKnit Long-Sleeve Half-Zip Thermal Base Layer Top - Women's$103.73Save 35%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- REI Co-opMerino 185 Base Layer Top - Women's Plus Sizes$69.95Underwear Weight:LightweightSize Type:Plus
- Wild RyeBassett Half-Zip Base Layer Top - Women's$107.93Save 20%compared to  $135.00Underwear Weight:MidweightSize Type:Regular, Plus
- Hot ChillysOriginals Solid Base Layer Pants - Kids'$34.73Save 26%compared to  $47.50Underwear Weight:MidweightSize Type:RegularREI OUTLET
- REI Co-opMerino 185 Base Layer Bottoms - Men's Tall Sizes$79.95Underwear Weight:LightweightSize Type:Tall, Big
- Kari TraaAnna Long-Sleeve Base Layer Top - Women's$76.93Save 30%compared to  $110.00Underwear Weight:MidweightSize Type:Regular
- KUHLReactiv Lite Grid Long-Sleeve Crew Base Layer Top - Women's$109.00Add to cart to see priceUnderwear Weight:LightweightSize Type:Regular
- IcebreakerMerino Base Layer Leggings - Women's$109.73Save 45%compared to  $200.00Size Type:RegularREI OUTLET
- SaxxRoast Master Midweight Long-Sleeve Crew Base Layer Top - Men's$47.73Save 36%compared to  $75.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Kari TraaFryd Base Layer Pants - Women's$44.93 - $60.00Underwear Weight:MidweightSize Type:Regular
- Helly HansenLIFA Merino Midweight Base Layer Hoodie - Men's$125.00Underwear Weight:MidweightSize Type:Regular
- Terramar1.0 All-Season Lightweight Merino Wool T-Shirt - Women's$34.73Save 30%compared to  $50.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Arms of Andes160 Ultralight Alpaca Wool Crewneck Base Layer T-Shirt - Men's$59.93Save 25%compared to  $80.00Underwear Weight:UltralightweightSize Type:Regular, Big
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes$89.95Underwear Weight:LightweightSize Type:Plus
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