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Base Layer Bottoms
(143 products)Products (143)
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- IcebreakerMerino 260 Tech Thermal Base Layer Leggings - Women'sTop Rated$93.73Save 25%compared to  $125.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:HeavyweightSize Type:PlusREI OUTLET
- The North FaceSummit Series Pro 120 Base Layer Tights - Women'sTop Rated$100.00Underwear Weight:UltralightweightSize Type:Regular, Plus
- SaxxRoast Master Midweight Base Layer Bottoms - Men's$52.73Save 29%compared to  $75.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- HalfdaysSophia Base Layer Leggings - Women's$49.83Save 41%compared to  $85.00Underwear Weight:LightweightSize Type:Plus, Regular
- Free CountryMicrotech Heat Cocaber Base Layer Bottoms - Women's$34.73Save 30%compared to  $50.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:LightweightSize Type:RegularREI OUTLET
- PatagoniaCapilene Thermal Weight Long Underwear Bottoms - Women's$99.00Underwear Weight:HeavyweightSize Type:Regular
- Icebreaker200 ZoneKnit Thermal Base Layer Leggings - Women's$109.73Save 26%compared to  $150.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Icebreaker125 ZoneKnit Merino Thermal Leggings - Men's$93.73Save 25%compared to  $125.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:UltralightweightSize Type:Regular, BigREI OUTLET
- REI Co-opMerino 185 Base Layer Bottoms - Women's Plus Sizes$79.95Underwear Weight:LightweightSize Type:Plus
- IcebreakerMerino 260 Tech Thermal Base Layer Leggings With Fly - Men'sTop Rated$93.73Save 25%compared to  $125.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:HeavyweightSize Type:Regular, BigREI OUTLET
- SmartwoolClassic All-Season Merino 3/4 Base Layer Bottoms - Men's$75.00Underwear Weight:LightweightSize Type:Regular, Big
- Terramar3.0 Thermawool Base Layer Tights - Women's$52.73Save 24%compared to  $70.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Helly HansenLIFA Merino Midweight 2-In-1 Base Layer Pants - Women's$69.73Save 30%compared to  $100.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino Base Layer Leggings - Women's$149.73Save 25%compared to  $200.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- REI Co-opMerino 185 Base Layer Bottoms - Men's Tall Sizes$79.95Underwear Weight:LightweightSize Type:Tall, Big
- SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Men's$130.00Underwear Weight:LightweightSize Type:Regular, Big
- Arms of Andes300 Lightweight Alpaca Wool Base Layer Leggings - Women'sTop Rated$105.00Underwear Weight:LightweightSize Type:Regular
- SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's$130.00Underwear Weight:LightweightSize Type:Regular
- KUHLReactiv Lite Grid Base Layer Bottoms - Men'sNew arrival$99.00Underwear Weight:LightweightSize Type:Regular
- ArtilectFlatiron 185 Base Layer Leggings - Women's$109.73Save 31%compared to  $160.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Arms of Andes300 Lightweight Alpaca Wool Base Layer Leggings - Men's$105.00Underwear Weight:LightweightSize Type:Regular, Big
- Icebreaker200 Oasis Sonebula Base Layer Leggings - Women's$89.73Save 25%compared to  $120.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Icebreaker125 ZoneKnit Base Layer Leggings - Men's$125.00Underwear Weight:UltralightweightSize Type:Regular, Big
- SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's Plus Sizes$115.00 - $120.00Underwear Weight:MidweightSize Type:Plus
- SmartwoolIntraknit Thermal Merino Base Layer 3/4 Bottoms - Men's$120.00Underwear Weight:LightweightSize Type:Regular
- Ortovox185 Rock'n'wool Short Base Layer Pants - Men's$100.00Underwear Weight:MidweightSize Type:Regular, Big
- Free CountryMicrotech Heat Base Layer Bottoms - Men's$31.73Save 29%compared to  $45.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:LightweightSize Type:BigREI OUTLET
- Ortovox120 Comp Light Short Base Layer Pants - Men's$70.00Underwear Weight:LightweightSize Type:Regular, Big
- Icebreaker200 Oasis 3/4 Base Layer Bottoms - Men's$95.00Underwear Weight:MidweightSize Type:Regular
- Free CountryCloud Knit Base Layer Bottoms - Women's$31.73Save 29%compared to  $45.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:LightweightSize Type:RegularREI OUTLET
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