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Men's Underwear
(177 products)Products (177)
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- SaxxKinetic Light-Compression Mesh Boxer Brief$28.73Save 24%compared to  $38.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- SaxxVibe Super Soft Boxer Briefs - Men's$25.73Save 24%compared to  $34.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:Regular, BigREI OUTLET
- StanceButter Blend Boxers - Men's$22.73Save 24%compared to  $30.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- SaxxDropTemp Cooling Mesh Boxer Briefs - Men's$26.73Save 29%compared to  $38.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:Regular, BigREI OUTLET
- SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men'sTop Rated$66.93 - $90.00Underwear Weight:LightweightSize Type:Regular, Big
- SmartwoolClassic All-Season Merino T-Shirt - Men's$59.93 - $80.00Underwear Weight:LightweightSize Type:Regular, Big
- Arc'teryxRho LT Base Layer Bottoms - Men's$49.83 - $100.00Underwear Weight:LightweightSize Type:Regular, Big
- SaxxUltra Super Soft Boxer Briefs - Men's$25.73Save 24%compared to  $34.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:Regular, BigREI OUTLET
- REI Co-opMidweight Base Layer Half-Zip Top - Men'sTop Rated$39.93 - $59.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men'sTop Rated$55.93 - $79.95Underwear Weight:LightweightSize Type:Regular, Big
- StanceCedar Rock Boxer Briefs - Men's$22.73Save 24%compared to  $30.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:Regular, BigREI OUTLET
- REI Co-opMerino 185 Base Layer Bottoms - Men's$23.83 - $79.95Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men'sTop Rated$39.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- StanceCurren Poly Boxer Briefs - Men's$18.73Save 25%compared to  $25.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Men'sTop Rated$85.93 - $115.00Underwear Weight:MidweightSize Type:Regular, Big
- SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's$70.93 - $95.00Underwear Weight:MidweightSize Type:Regular, Big
- StanceSandy Beach Boxer Briefs - Men's$19.73Save 26%compared to  $27.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- REI Co-opLightweight Base Layer Bottoms - Men'sTop Rated$39.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- REI Co-opLightweight Crew Base Layer Top - Men'sTop Rated$29.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- StanceGeo Serape Boxer Briefs - Men's$22.73Save 24%compared to  $30.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- SaxxVolt Breathable Mesh Boxer Briefs - Men's$26.73Save 23%compared to  $35.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:Regular, BigREI OUTLET
- REI Co-opMidweight Long-Sleeve Base Layer Top - Men'sTop Rated$54.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- StanceTubeular Boxer Briefs - Men's$18.73Save 25%compared to  $25.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- REI Co-opMidweight Base Layer Bottoms - Men's$54.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- StanceOcean Blue Boxer Briefs - Men's$22.73Save 24%compared to  $30.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- tasc PerformanceElevation Merino T-Shirt - Men's$49.73Save 37%compared to  $79.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- SaxxTraining Shorts Liner - Men's$29.73Save 25%compared to  $40.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletSize Type:RegularREI OUTLET
- Arc'teryxRho Merino Wool Zip-Neck Base Layer Top - Men's$69.83 - $98.83Save 29% - 50%compared to  $140.00Underwear Weight:MidweightSize Type:Regular, Big
- Arc'teryxRho LT Zip-Neck Base Layer Top - Men'sTop Rated$59.83 - $120.00Underwear Weight:LightweightSize Type:Regular, Big
- Royal RobbinsReadyDry Crew T-Shirt - Men's$26.73Save 33%compared to  $40.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletREI OUTLET
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