Sun-Protective Fabric Men's Underwear
(30 products)- REI Co-opHeavyweight Merino Base Layer Bottoms - Men'sTop Rated$69.93 - $99.95Underwear Weight:HeavyweightSize Type:Regular, Big, Tall
- REI Co-opMidweight Long-Sleeve Base Layer Top - Men'sTop Rated$37.93 - $54.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's$69.93 - $99.95Underwear Weight:HeavyweightSize Type:Regular, Big, Tall
- REI Co-opMerino 185 Base Layer Bottoms - Men's$55.93 - $79.95Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMidweight Base Layer Bottoms - Men's$54.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men'sTop Rated$69.93 - $120.00Underwear Weight:MidweightSize Type:Regular, Big
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men'sTop Rated$62.93 - $89.95Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMidweight Base Layer Half-Zip Top - Men'sTop Rated$41.93 - $59.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men'sTop Rated$79.95Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's$72.93 - $104.95Underwear Weight:HeavyweightSize Type:Regular, Big, Tall
- REI Co-opLightweight Base Layer Bottoms - Men'sTop Rated$44.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's$44.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- Sale Ends Feb 9Icebreaker200 Sonebula Leggings - Men'sTop Rated$71.73Save 40%compared to  $120.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- REI Co-opLightweight Crew Base Layer Top - Men'sTop Rated$14.83 - $34.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men'sTop Rated$89.93 - $140.00Underwear Weight:HeavyweightSize Type:Regular, Big
- REI Co-opMerino 185 Base Layer Top - Men's$69.95Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opLightweight Half-Zip Base Layer Top - Men'sTop Rated$19.83 - $49.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- Icebreaker260 Merino Tech Thermal Leggings with Fly - Men'sTop Rated$140.00Underwear Weight:HeavyweightSize Type:Regular, Big
- IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men'sTop Rated$120.00Underwear Weight:MidweightSize Type:Regular, Big
- KUHLReactiv Lite Grid Quarter-Zip Base Layer Top - Men's$119.00Underwear Weight:LightweightSize Type:Regular, Big
Earn 15% in total rewards
Get 5% on all REI Co-op purchases plus the 10% Co-op Member Reward you earn on eligible full-price purchases.
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Terms apply- KUHLReactiv Lite Grid Base Layer Bottoms - Men'sTop Rated$99.00Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's Tall SizesTop Rated$89.95Underwear Weight:LightweightSize Type:Tall, Big
- Arms of Andes300 Alpaca Wool Long-Sleeve Crew Base Layer Top - Men's$96.93 - $104.93Save 25%compared to  $130.00 - $140.00Underwear Weight:LightweightSize Type:Regular, Big
- Icebreaker200 Oasis Crewe Base Layer Top - Men's$110.00Underwear Weight:MidweightSize Type:Regular, Big
- KUHLReactiv Lite Grid Long-Sleeve Crew Base Layer Top - Men's$109.00Underwear 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
- REI Co-opMerino 185 Base Layer Bottoms - Men's Tall Sizes$79.95Underwear Weight:LightweightSize Type:Tall, Big
- NRSH2Core Lightweight Union Suit - Men's$109.95Underwear Weight:MidweightSize Type:Regular, Big
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's Tall SizesTop Rated$79.95Underwear Weight:LightweightSize Type:Tall
- Hot ChillysClima-Wool Crew Base Layer Top - Men's$79.73Save 33%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLET




































































































































