Polyester. High quality breathable fabric. Breathable – no-top hat designed for ventilation to accelerate sweat evaporation when doing outdoor activities. Protect your skin from harmful UV rays and keep your hair out of your face and eyes by wearing this comfortable baseball cap during all your outdoor activities. Suitable for leisure, hip hop, sports, summer beach activities, friends gatherings, costume parties or any other occasion. We recommend wash by hand to prevent the washing machine damage the shape of caps.