This hat is for the adventurer. Thrill seeker. 100% Nylon hat with snapback closure. This hat is lightweight and can be easily packed for your next adventure. This hat can get wet but do not submerge in water. If you do make sure to completely dry it due to metal grommet located in the interior of the hat that may rust. Measurements: 6-18 months (48cm) 2-5 years (52cm) Youth/5 years+ (56cm)