Skip to search results
loaded 381 results
Base Layers
(381 products)Products (381)
Sort: Best Match
- SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's$130.00Underwear Weight:LightweightSize Type:Regular
- Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Men's$84.73Save 26%compared to  $115.00Save up to 30% extra on your REI Outlet purchase, thru 12/16.Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Women'sTop Rated$99.73Save 26%compared to  $135.00Save up to 30% extra on your REI Outlet purchase, thru 12/16.Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- Helly HansenLifa Merino Midweight Crew Base Layer Top - Men's$105.00Underwear Weight:MidweightSize Type:Regular, Big
- SmartwoolClassic All-Season Merino 3/4 Base Layer Bottoms - Men's$75.00Underwear Weight:LightweightSize Type:Regular, Big
- Free CountryForce Grid Fleece Base Layer Bottoms - Men's$29.73Save 33%compared to  $45.00Save up to 30% extra on your REI Outlet purchase, thru 12/16.Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- SaxxRoast Master Midweight Base Layer Bottoms - Men's$47.73Save 36%compared to  $75.00Save up to 30% extra on your REI Outlet purchase, thru 12/16.Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$135.00Underwear Weight:MidweightSize Type:Regular, Plus
- REI Co-opMerino 185 Base Layer Top - Women's$69.95Underwear Weight:LightweightSize Type:Regular
- Terramar3.0 Thermawool Crew Base Layer Top - Women's$49.73Save 28%compared to  $70.00Save up to 30% extra on your REI Outlet purchase, thru 12/16.Underwear Weight:MidweightSize Type:RegularREI OUTLET
- REI Co-opLightweight Half-Zip Base Layer Top - Women'sTop Rated$44.95Underwear Weight:LightweightSize Type:Regular, Plus
- KUHLReactiv Lite Grid Long-Sleeve Crew Base Layer Top - Men's$109.00Underwear Weight:LightweightSize Type:Regular, Big
- IcebreakerMerino 200 Oasis+ Long-Sleeve Half-Zip Thermal Base Layer Hoodie - Men'sNew arrival$150.00Underwear Weight:MidweightSize Type:Regular, Big
- Arc'teryxRho Boot Cut Base Layer Bottoms - Women's$72.73Save 19%compared to  $90.00Save up to 30% extra on your REI Outlet purchase, thru 12/16.Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Active Base Layer Crew Shirt - Women's$79.73Save 27%compared to  $110.00Save up to 30% extra on your REI Outlet purchase, thru 12/16.Underwear Weight:MidweightSize Type:RegularREI OUTLET
- PatagoniaCapilene Midweight Crew Base Layer Top - Women'sTop Rated$89.00Underwear Weight:MidweightSize Type:Regular, Plus
- Icebreaker200 Oasis Crewe Long-Sleeve Base Layer Top - Kids'Top Rated$60.00Underwear Weight:MidweightSize Type:Regular
- Arc'teryxRho Insulated 3/4 Base Layer Bottoms - Men'sTop Rated$159.73Save 20%compared to  $200.00Save up to 30% extra on your REI Outlet purchase, thru 12/16.Underwear Weight:HeavyweightSize Type:Regular, BigREI OUTLET
- Kari TraaFryd Base Layer Pants - Women's$40.73Save 25% - 32%compared to  $55.00 - $60.00Save up to 30% extra on your REI Outlet purchase, thru 12/16.Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- PatagoniaCapilene Thermal Weight Long-Underwear Bottoms - Men's$99.00Underwear Weight:HeavyweightSize Type:Regular
- Free CountryMicrotech Heat Cocarber Base Layer Top - Women's$39.73Save 33%compared to  $60.00Save up to 30% extra on your REI Outlet purchase, thru 12/16.Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Icebreaker150 Anatomica Crewe Base Layer Top - Men'sTop Rated$75.00Underwear Weight:LightweightSize Type:Regular, Big
- Arc'teryxRho Base Layer Bottoms - Women's$100.00Underwear Weight:LightweightSize Type:Regular, Plus
- Terramar2.0 Thermolator Crew Base Layer Top - Kids'New arrival$24.73Save 29%compared to  $35.00Save up to 30% extra on your REI Outlet purchase, thru 12/16.Underwear Weight:LightweightSize Type:RegularREI OUTLET
- StioBasis PeakWool Midweight Half-Zip Base Layer Top - Men's$159.00Underwear Weight:MidweightSize Type:Regular, Big
- Helly HansenLIFA Merino Midweight Base Layer Hoodie - Men's$125.00Underwear Weight:MidweightSize Type:Regular, Big
- Helly HansenLIFA Merino Midweight 2-In-1 Graphic Half-Zip Base Layer Top - Women's$86.73Save 27%compared to  $120.00Save up to 30% extra on your REI Outlet purchase, thru 12/16.Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Thermal Merino Colorblock Quarter-Zip Base Layer Top - Women's$140.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaSara Long-Sleeve Base Layer Top - Women's$74.73Save 25%compared to  $100.00Save up to 30% extra on your REI Outlet purchase, thru 12/16.Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Terramar2.0 Thermolator Base Layer Pants - Men'sNew arrival$32.73Save 27%compared to  $45.00Save up to 30% extra on your REI Outlet purchase, thru 12/16.Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
121–150 of 381 products
Sort: Best Match