Polyester, lightweight, breathable and comfortable wear 3" (7.6cm) Wide brim, One size fits most head Circumference: 22.0"-23.2"/56-59 CM UPF 50+ sun protection hat offer the highest sun protection available,block 98%+ of damaging UVA and UVB sun rays The mesh side vents for superior airflow and internal moisture wicking sweatband for comfortable fit Adjustable Chin Strap,Adjustable drawcord and toggle at back for comfortable fit Must-have summer safari sun hat is perfect for any outdoor activities: fishing, hiking, cycling, camping, hunting, gardening, boating and any more others