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Men's Underwear
(188 products)Products (188)
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- REI Co-opMidweight Base Layer Half-Zip Top - Men'sTop Rated$19.83 - $41.89Save 30% - 66%compared to  $59.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men'sTop Rated$29.83 - $89.95Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men'sTop Rated$29.83 - $79.95Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMidweight Long-Sleeve Base Layer Top - Men'sTop Rated$26.83 - $38.39Save 30% - 51%compared to  $54.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- REI Co-opEveryday Boxer Briefs - Men's$22.95Size Type:Regular, Big
- REI Co-opEveryday Boxers - Men's$22.95Size Type:Regular, Big
- IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men'sTop Rated$51.83 - $105.00Underwear Weight:MidweightSize Type:Regular, Big
- Arc'teryxIonia Merino Wool Base Layer Top - Men'sTop Rated$63.93Save 28%compared to  $90.00Underwear Weight:MidweightSize Type:Regular, Big
- Sale Ends Sep 1REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men'sTop Rated$27.89Save 30%compared to  $39.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- SaxxKinetic Light-Compression Mesh Boxer Brief$28.73Save 24%compared to  $38.00Members use code LABORDAY2025 for an extra 20% off at REI OutletSize Type:RegularREI OUTLET
- SaxxVibe Super Soft Boxer Briefs - Men's$25.73Save 24%compared to  $34.00Members use code LABORDAY2025 for an extra 20% off at REI OutletSize Type:RegularREI OUTLET
- SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men'sTop Rated$44.83 - $90.00Underwear Weight:LightweightSize Type:Regular, Big
- Arc'teryxIonia Merino Wool Base Layer Hoody - Men'sTop Rated$98.93Save 29%compared to  $140.00Underwear Weight:MidweightSize Type:Regular, Big
- SmartwoolClassic All-Season Merino T-Shirt - Men's$39.83 - $80.00Underwear Weight:LightweightSize Type:Regular, Big
- Free FlyElevate Boxer Briefs - Men's$28.73Save 24%compared to  $38.00Members use code LABORDAY2025 for an extra 20% off at REI OutletSize Type:Regular, BigREI OUTLET
- Sale Ends Sep 1REI Co-opLightweight Base Layer Bottoms - Men'sTop Rated$27.89Save 30%compared to  $39.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- REI Co-opMerino 185 Base Layer Bottoms - Men's$79.95Underwear Weight:LightweightSize Type:Regular, Big
- Sale Ends Sep 1REI Co-opMidweight Base Layer Bottoms - Men's$38.39Save 30%compared to  $54.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- PatagoniaCapilene Midweight Base Layer Bottoms - Men'sTop Rated$59.93 - $89.00Underwear Weight:MidweightSize Type:Regular, Big
- PatagoniaCapilene Midweight Crew Base Layer Top - Men'sTop Rated$59.93 - $89.00Underwear Weight:MidweightSize Type:Regular, Big
- Arc'teryxRho LT Zip-Neck Base Layer Top - Men'sTop Rated$120.00Underwear Weight:LightweightSize Type:Regular, Big
- Sale Ends Sep 1REI Co-opLightweight Crew Base Layer Top - Men'sTop Rated$20.89Save 30%compared to  $29.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- Ortovox185 Merino Rock'n'wool Long-Sleeve Base Layer Top - Men's$54.83Save 50%compared to  $110.00Underwear Weight:MidweightSize Type:Regular, Big
- SaxxVolt Breathable Mesh Boxer Briefs - Men's$26.73Save 23%compared to  $35.00Members use code LABORDAY2025 for an extra 20% off at REI OutletSize Type:Regular, BigREI OUTLET
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Men'sTop Rated$115.00Underwear Weight:MidweightSize Type:Regular, Big
- tasc PerformanceElevation Merino Base Layer Bottoms - Men's$49.73Save 37%compared to  $79.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:LightweightSize Type:Big, RegularREI OUTLET
- SmartwoolClassic Thermal Merino Base Layer Bottoms - Men'sTop Rated$115.00Underwear Weight:MidweightSize Type:Regular, Big
- Ortovox185 Rock'n'wool Short Base Layer Pants - Men's$49.83Save 50%compared to  $100.00Underwear Weight:MidweightSize Type:Regular, Big
- tasc PerformanceElevation Merino T-Shirt - Men's$49.73Save 37%compared to  $79.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- SaxxUltra Super Soft Boxer Briefs - Men's$25.73Save 24%compared to  $34.00Members use code LABORDAY2025 for an extra 20% off at REI OutletSize Type:Regular, BigREI OUTLET
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