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Long Sleeve Base Layers
(234 products)Products (234)
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- IcebreakerMerino 200 ZoneKnit Long-Sleeve Half-Zip Base Layer Top - Men'sNew arrival$160.00Underwear Weight:MidweightSize Type:Regular, Big
- Free CountryForce Grid Fleece Base Layer Top - Men's$29.73Save 33%compared to  $45.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:LightweightSize Type:BigREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Turtleneck Base Layer - Men'sTop Rated$135.00Underwear Weight:MidweightSize Type:Big
- ArtilectFlatiron 185 Crew Base Layer Top - Men's$96.73 - $109.73Save 30% - 31%compared to  $140.00 - $160.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Ortovox230 Competition Long-Sleeve Base Layer Top - Men's$110.00Underwear Weight:MidweightSize Type:Regular, Big
- Helly HansenLifa Merino Midweight Half-Zip Base Layer Top - Men'sTop Rated$110.00 - $115.00Underwear Weight:MidweightSize Type:Regular
- Ortovox185 Rock'N'Wool Zip Neck Base Layer Top - Men'sNew arrival$130.00Underwear Weight:LightweightSize Type:Regular, Big
- Ortovox185 Rock'N'Wool Long-Sleeve Base Layer Top - Men'sNew arrival$120.00 - $130.00Underwear Weight:LightweightSize Type:Regular, Big
- Helly HansenLifa Merino Midweight Crew Base Layer Top - Men's$105.00Underwear Weight:MidweightSize Type:Regular
- StioBasis PeakWool Midweight Half-Zip Base Layer Top - Men'sNew arrival$149.00Underwear Weight:MidweightSize Type:Regular
- REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women'sTop Rated$104.95Underwear Weight:HeavyweightSize Type:Regular, Plus
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'$44.73Save 31%compared to  $65.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Sale Ends Sep 1REI Co-opLightweight Base Layer Crew Top - Kids'Top Rated$20.89Save 30%compared to  $29.95Underwear Weight:LightweightSize Type:Regular
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes$29.83 - $89.95Underwear Weight:LightweightSize Type:Plus
- SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Women's$89.73Save 25%compared to  $120.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:Regular, PlusREI OUTLET
- Free CountryForce Grid Fleece Base Layer Top - Women's$34.73Save 36%compared to  $55.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:LightweightSize Type:RegularREI OUTLET
- Kari TraaFryd Base Layer Top - Women's$29.83 - $65.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaEmbla Wool Long-Sleeve Base Layer Top - Women's$39.83 - $90.00Underwear Weight:UltralightweightSize Type:Regular
- Terramar2.0 Cloud Nine Half-Zip Base Layer Top - Women's$34.73Save 30%compared to  $50.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Free CountryMicrotech Heat Cocaber Base Layer Top - Women's$34.73Save 30%compared to  $50.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:LightweightSize Type:RegularREI OUTLET
- Nani SwimwearUinta Base Layer Top - Women's$19.83Save 75%compared to  $80.00Underwear Weight:MidweightSize Type:Regular
- PatagoniaCapilene Midweight Crew Base Layer Top - Women'sTop Rated$59.93 - $89.00Underwear Weight:MidweightSize Type:Regular, Plus
- Helly HansenLIFA Merino Midweight Half-Zip Base Layer Top - Women's$79.73 - $82.73Save 24% - 27%compared to  $110.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Terramar3.0 Thermawool Half-Zip Base Layer Top - Women's$56.73Save 24%compared to  $75.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Arc'teryxRho Zip-Neck Base Layer Top - Women'sTop Rated$79.93 - $120.00Underwear Weight:LightweightSize Type:Regular, Plus
- SpraywayEffra Crew Base Layer Top - Women's$36.73Save 26%compared to  $49.95Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's$96.73Save 25%compared to  $130.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaRose Base Layer Hoodie - Women's$97.73Save 24%compared to  $130.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Terramar3.0 Thermawool Crew Base Layer Top - Women's$49.73 - $52.73Save 24% - 28%compared to  $70.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Women'sTop Rated$99.73Save 26%compared to  $135.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
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