Adjustable Size - Medium best fits for 56-57.5cm,22"-22.6",With an adjustable tape built inside sweatband
DETACHABLE CHIN STRAP: adjustable for a better fit; won't blown off when it gets windy.
Crushable & Packable - you can fold or roll-up 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 the product images.
Beach Camping UPF 50+ Sun Protective - the wide brim blocks most sun UV rays and provides excellent shade protect for face and neck.
Breathable & Ventilated & Moisture Wicking & Lightweight - the side opening allows air flow well in, so it will not overheat in the summer. The inbuilt 100% cotton sweatband increase the levels of comfort by wicking away any sweat.