100% Polyester Imported Buckle closure Hand Wash Only ☀QUICK DRYING AND LIGHTWEIGHT: 100% Polyester, thin soft and light material. Customized fit. The back opening is designed features an adjustable Velcro closure. ☀SIZE: This thin and light running cap is only 2.1 ounces, It's a smaller hat, head Circumference is 21.6inch-23.2 inch but the tail of the hat can be adjusted, hat brim width is 7cm it hiking and running essential that won’t weigh you down! ☀Style: Cap is designed to fit most women. Unique mesh structure, moisture wicking fabric works to help keep you dry and comfortable. The soft fabric fits your head better. Women Quick Drying Baseball Cap Sun Hats Mesh Lightweight UV Protection for Outdoor Sports Multiple Colors - BU87W8CUV