Wearing this hat is like wearing an ice-cold towel. - Soak Chiller hats in cold water then wear them during your golf round - Chillers remain very cold for 5+ minutes, quite cold for 15+ minutes and comfortably cool until dry (1 - 3 hours). - Re-chill with a quick refreshing splash as necessary. - It stops sweat and stains plus it is wearable and crushable. - It`s made of rich and soft ultra-light chamois. - It will not fade. - The unique perforated fabric allows ventilation, but blocks the sun.