UPF 50+ Ultimate Sun Protection! Non-Perforated/Dermatologist recommended, and at the same time, wearing this hat, is like wearing an ice-cold towel. Soak our 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. Adding water stops sweat and stains, It’s made of quality, synthetic suede that’s comfortable lightweight and rugged. It will not fade. The Non-perforated fabric provides ultimate sun protection. It may even improve your golf game! Hat Size Chart: Head Size Medium 6 1/2 to 7 (21" - 22 ") Large 7 to 7 1/2 (22 " - 23 1/2 ") X-Large 7 1/2 - 7 3/4 (23 1/2 " - 24") . Color tone may vary.