OTTO CAP Bucket Hat, OTTO CAPs 1 Cool Comfort Performance Bucket Hats, Key Product Features. Polyester Jersey Knit Fabric - Soft, smooth, and stretchy feel that is comfortable against the skin Performance Fabric - Helps keep the head dry by drawing sweat away from the skin, making it perfect for workouts and outdoor activities Wide Downwards Sloping Brim - Offers ample sun protection and a stylish, casual look UV Guard Technology - Blocks harmful UV rays Laser-Perforated Back - Circle perforations maximize ventilation for superior cooling Cool Comfort Standard Performance Sweatband - Antibacterial, anti-odor and moisture wicking properties