Polyester,Mesh Elastic closure Material:100% polyester One size: best fit for head size 58cm-60cm (7 1/4- 7 1/2). Please kindly check your head size before you buy Breathable and lightweight newsboy flat cap summer hat Back with an elastic band allowing this hat to have a secure fit Ideal for summer and hot weather VOBOOM Men Breathable Mesh Summer Hat Newsboy Beret Ivy Cap Cabbie Flat Cap - BD5ZSP37J