Skip to search results
loaded 221 results
Base Layer Tops
(221 products)Products (221)
Sort: Best Match
- Arms of Andes300 Lightweight Alpaca Wool Half-Zip Base Layer Top - Women's$115.00 - $135.00Underwear Weight:LightweightSize Type:Regular
- ArtilectFlatiron 185 Crew Base Layer Top - Men's$96.73 - $109.73Save 30% - 31%compared to  $140.00 - $160.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Arms of Andes160 Ultralight Alpaca Wool Long-Sleeve Base Layer Shirt - Women's$85.00 - $100.00Underwear Weight:UltralightweightSize Type:Regular
- Terramar2.0 Cloud Nine Midweight Performance Thermal Turtleneck - Women's$32.73Save 31%compared to  $48.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- SpraywayEffra Crew Base Layer Top - Women's$36.73Save 26%compared to  $49.95Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- ArtilectDarkhorse 185 Zoned Crew Base Layer Top - Women's$98.73Save 38%compared to  $160.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaMalia Long-Sleeve Base Layer Top - Women's$52.73Save 24%compared to  $70.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:Regular, PlusREI OUTLET
- Kari TraaVoss Cashmere Mix Half-Zip Base Layer Top - Women's$116.73Save 35%compared to  $180.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- PatagoniaCapilene Thermal Weight Zip-Neck Long Underwear Top - Women's$109.00Underwear Weight:HeavyweightSize Type:Regular
- SpraywayEffra Hoody Base Layer Top - Women's$49.73Save 28%compared to  $69.95Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- SpraywayEffra Jacket Base Layer Top - Women's$46.73Save 28%compared to  $64.95Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- ArtilectDarkhorse 185 Zoned Quarter-Zip Base Layer Top - Women's$116.73Save 31%compared to  $170.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaEmbla Wool Long-Sleeve Base Layer Top - Women's$80.00Underwear Weight:UltralightweightSize Type:Regular
- Kari TraaAlma Hood Base Layer Top - Women's$59.73Save 25%compared to  $80.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:UltralightweightSize Type:RegularREI OUTLET
- Kari TraaAlma Half-Zip Base Layer Top - Women's$59.73Save 25%compared to  $80.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:UltralightweightSize Type:RegularREI OUTLET
- Kari TraaLilja Long-Sleeve Base Layer Top - Women's$49.73Save 24%compared to  $66.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:HeavyweightSize Type:RegularREI OUTLET
- CraftCore Dry Active Comfort Long-Sleeve Base Layer Jersey - Kids'$38.73Save 40%compared to  $64.95Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Arc'teryxRho Merino Wool Crew Neck Base Layer Top - Men'sTop Rated$59.83 - $120.00Underwear Weight:MidweightSize Type:Big, Regular
- Terramar2.0 Ultra Merino Turtleneck Base Layer Top - Women's$52.73Save 29%compared to  $75.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- The North FaceSummit Series Pro 120 Crew Base Layer Top - Women'sTop Rated$100.00Underwear Weight:UltralightweightSize Type:Regular, Plus
- KUHLReactiv Lite Grid Quarter-Zip Base Layer Top - Men'sNew arrival$119.00Underwear Weight:LightweightSize Type:Regular
- KUHLReactiv Lite Grid Long-Sleeve Crew Base Layer Top - Men'sNew arrival$109.00Underwear Weight:LightweightSize Type:Regular
- Kari TraaFloke Long-Sleeve Base Layer Top - Women's$74.73Save 25%compared to  $100.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- The North FaceFD Pro 160 Base Layer Crew Top - Women's$70.00Underwear Weight:MidweightSize Type:Regular
- Ortovox185 Merino Rock'n'wool Base Layer Top - Women's$49.83Save 50%compared to  $100.00Underwear Weight:MidweightSize Type:Regular
- KUHLReactiv Lite Grid Long-Sleeve Crew Base Layer Top - Women'sNew arrival$109.00Underwear Weight:LightweightSize Type:Regular
- KUHLReactiv Lite Grid Quarter-Zip Base Layer Top - Women'sNew arrival$119.00Underwear Weight:LightweightSize Type:Regular
- Kari TraaSmekker Half-Zip Base Layer Top - Women's$130.00Underwear Weight:LightweightSize Type:Regular
- Kari TraaSilja Half-Zip 2.0 Base Layer Top - Women'sNew arrival$110.00Underwear Weight:HeavyweightSize Type:Regular
- IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men'sTop Rated$125.00Underwear Weight:HeavyweightSize Type:Regular, Big
121–150 of 221 products
Sort: Best Match