MATERIAL : Made of 90% paper straw and 10 % polyester. Straw material. Soft comfortable and breathable to wear. ONE SIZE FITS MOST : One Size fit most lady women,hat circumference 22.5" ; brim 4.1". Comes with a CHIN STRAP which is adjustable for a snug fit; won't blow off when it gets windy. FOLDABLE & PACKABLE : It can be easily carried inside your handbag or beach tote, packable and convenient to carry and absolutely save lots of space.