VBIGER Women's Summer Sun Hat Large Wide Brim Roll-up Straw Hats Polka Dot Ribbon Visor Size S for child:Circumference is 18.89-21.26inches,hats brim is 3.34inches;Size L for adult:Circumference is 21.26-22.83inches,hats brim is 5.31inches Spiral roof technology is quite tough, which wont distort Stitching is evenly applied, which is not easy to torn Foldable design is quite easily portable,A real help when you go outing Exquisite workmanship