The Cool Flapp™ provides excellent sun protection to the back of your neck from the harmful UV rays of the sun conveniently whenever you want! The Cool Flapp™ really cools you down and keeps you protected from the sun on those hot days! When soaked in cold water first, it will provide instant relief from the heat! The Ball Cap Neck Cool Flapp™ quickly and easily fastens and unfastens to your favorite ball cap. Made of 100% cotton, nature's own best sun filter. Secures with hook & loop fasteners over the adjustment strap in the back of the cap. Hand or Machine Washable! 100% Satisfaction Guaranteed. Made in the U.S.A.