The sun hat is made of superior quick-drying polyester, skin-friendly, lightweight, breathable to wear. Mesh layers greatly promote air circulation and allow for moisture and heat to easily escape these hats; inner sweatband removes sweat from eyes and face; keep you cool and comfortable during the whole summer. UV protection hat features a floppy wide brim and UPF 50+ sun protection, which can block 98% of harmful rays; 3.35" wide brim provides a perfect shade to your face, neck and ears. Designed with a ponytail hole on the back of the hat, which gives many conveniences to ladies with long ponytails or buns. Hat Circumference: 21"-23", Hat Height: 4", Adjustable elastic buckle at the back of fishing hat is for adjusting the hat circumference to fit your head size.