How to Choose Base Layers
REI Co-op Lightweight Long Underwear Bottoms - Men's Extended Sizes
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The REI Lightweight long underwear bottoms are an excellent performance insulation layer.
Shop similar products- Quick-drying polyester fabric wicks moisture away from your skin
- Loose fit features two-way comfort stretch
- Flatseam construction is soft and non-chafing next to skin
- REI® logo elastic waist is soft against skin
- Finished with cross-over fly and comfortable cuffs
- Fabric provides UPF 50+ sun protection, shielding skin from harmful ultraviolet rays
- REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world
Imported.
View all REI Co-op Men's Base Layer Bottoms| Best Use | Multisport |
|---|---|
| Fabric | Polyester |
| Sun-Protective Fabric | Yes |
| Gender | Men's |
| Sustainability | From a Climate Label Certified brand |
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Better gear is built together
From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.
