100% paper straw. Size Adjustable – Medium best fits for 56-59CM 22-23.2; Large best fits for 59-60CM 23.2-23.6; X-Large best fits for 61-62CM 24-24.4 7 5/8- 7 3/4. With an adjustable velcro size tape built inside sweatband. Foldable & Packable – you can slightly fold it and tuck in away in suitcase, great for cruise, beach vacation, outdoor and the like. Also it can regain its shape easily, but sometimes you might need steam/ironing machine to reshape it, you can find the instruction from the product images. Unisex Straw Fedora – this short brim sun hat looks stylish on both male and female. Breathable & Lightweight – so it does not overheat in the summer, the brim can also provide some sun coverage. Ventilated – perfect for beach vacation, also great for summer rides, fishing and hiking.