NIKE Daybreak Running Cap Nike Sphere Dry fabric - to wick sweat away, reducing cling and helping you stay dry and comfortable. Comfort bill - for zero distractions and to keep out sun. Quick adjust closure - at back for enhanced fit. Reflective Stitching - for enhanced visibility in low-light conditions. Fabric: Body/bill: 100% polyester. Sweatband: Nike Sphere Dry 100% polyester.