NIKE Lady Daybreak Running Cap Nike Sphere Dry fabric - Wicks 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.