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Base Layers
(349 products)Products (349)
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- Helly HansenLIFA Merino Midweight 2-In-1 Graphic Half-Zip Base Layer Top - Women's$86.73Save 27%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Men's$135.00 - $150.00Underwear Weight:MidweightSize Type:Regular, Big
- Arms of Andes300 Lightweight Alpaca Wool Half-Zip Base Layer Top - Men's$107.93Save 25%compared to  $145.00Underwear Weight:LightweightSize Type:Regular, Big
- HalfdaysHallie Midweight Merino Base Layer Leggings - Women'sTop Rated$130.00Underwear Weight:MidweightSize Type:Regular
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'Top Rated$65.00Underwear Weight:MidweightSize Type:Regular
- SpraywayEffra Crew Base Layer Top - Women's$36.73Save 26%compared to  $49.95Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Arc'teryxRho LT Base Layer Bottoms - Men's$79.73Save 20%compared to  $100.00Underwear Weight:MidweightSize Type:BigREI OUTLET
- SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's$92.73Save 28%compared to  $130.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Helly HansenLifa Merino Midweight Graphic Base Layer Top - Women'sTop Rated$79.73 - $82.73Save 24% - 27%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- ArtilectDarkhorse 185 Zoned Quarter-Zip Base Layer Top - Women's$98.73Save 41%compared to  $170.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- StioBasis PeakWool Midweight Base Layer Tights - Men's$103.93Save 30%compared to  $149.00Underwear Weight:MidweightSize Type:Regular, Big
- Icebreaker200 Oasis Crewe Base Layer Top - Men's$110.00Underwear Weight:MidweightSize Type:Regular, Big
- PatagoniaCapilene Thermal Weight Zip-Neck Long Underwear Top - Women's$109.00 - $115.00Underwear Weight:HeavyweightSize Type:Regular
- Terramar3.0 Thermawool Crew Base Layer Top - Women's$52.73Save 24%compared to  $70.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaRose Capri High-Waist Base Layer Bottoms - Women's$110.00Underwear Weight:HeavyweightSize Type:Regular
- Hot ChillysOriginals Print Base Layer Crew - Kids'$39.73Save 27%compared to  $55.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaRose Light Capri Base Layer Pants - Women's$74.73Save 25%compared to  $100.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SpraywayEffra Jacket Base Layer Top - Women's$42.73Save 34%compared to  $64.95Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- Wild RyeBassett LITE Base Layer Leggings - Women's$70.93Save 20%compared to  $89.00Underwear Weight:LightweightSize Type:Regular, Plus
- 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
- Helly HansenLIFA Merino Midweight Half-Zip Base Layer Top - Women's$57.73Save 47%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- ArtilectDarkhorse 185 Zoned Base Layer Leggings - Women's$82.73Save 48%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Helly HansenHH LIFA Crew Base Layer Top - Women's$50.00Underwear Weight:LightweightSize Type:Regular
- SpraywayEffra Hoody Base Layer Top - Women's$49.73Save 28%compared to  $69.95Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Arms of Andes160 Ultralight Alpaca Wool Long-Sleeve Base Layer Shirt - Men's$66.93Save 25%compared to  $90.00Underwear Weight:UltralightweightSize Type:Regular, Big
- Icebreaker260 ZoneKnit Long-Sleeve Crewe Base Layer Top - Women'sTop Rated$119.73Save 27%compared to  $165.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaFryd Long-Sleeve Base Layer Top - Women's$40.73Save 32%compared to  $60.00Underwear Weight:LightweightSize Type:Plus, RegularREI OUTLET
- Arc'teryxKyanite Base Layer Bottoms - Women'sTop Rated$96.73Save 19%compared to  $120.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Arms of Andes300 Lightweight Alpaca Wool Base Layer Leggings - Men's$85.93Save 25%compared to  $115.00Underwear Weight:LightweightSize Type:Regular, Big
- TerramarC-Suite Mammoth Sherpa Fleece Mid-Layer Pants - Men's$56.73Save 29%compared to  $80.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
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