[Size Details]--Back neck flap length:5.9'';hat brim width:4.7'';cap depth:4.3''cm;hat's circumference is 22-22.8'',suits for most women.; [Comfortable and Breathable Material ]--For the balance between better UV protection and wearing comforness,this women sunhat uses breathable polyester cotton,which is not just can better block the UV out , but also softer and breathable,perfect for hot summer.With a chin strap,keep the hat stay on head and easy for carrying.