1. This sun hat combined with a wide brim, face & neck flap (flap are removable) can keep the sun off your head, face, and neck. 2. Adjustable chin strap to ensure that the hat can maintain comfortable conditions even in strong winds. 3. Made of waterproof nylon fabric and polyester net mesh, easy to clean, breathable, quick-drying, wear-resistant, lightweight, and comfortable wear.