Nike Dri-Fit Solar Sleeves (S/M) - White Dri-FIT UV fabric to help keep you dry and comfortable while helping to protect against UV rays Stretch opening at upper arm with no-slip taping for a snug, unrestricted fit Lightweight carrying case with zip closure and mesh at back for secure, breathable storage Flat-seam construction to reduce chafing Fabric: Sleeves: Dri-FIT UV 84% polyester/16% spandex. Bag: 100% polyester.