61%viscose / 23%polyester / 16%nylon. Crushable & Packable – you can easily fold it and tuck in away in suitcase, great for cruise, outdoor trip, beach vacation 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 images. Feminine & Reversible – one side in solid color and another side in cute floral color. Plus it lookes more stylish than most ladies outdoor hiking or fishing hats. DETACHABLE CHIN STRAP – the neck cord can protect your hat from flying off in wind during travel, gardening or beach vacation. Ponytail Hole – great to pull your bun or ponytail through during summer days. SIZE: Best fit for 55-59cm 21.6-23.2, with an adjustable drawstring built in sweatband.