●Full Cut ABS outer shell cover and protect from the forehead area to the lower head area.Provide users with comprehensive head protection. ●Quick dry soft EVA absorption liner.Meets CE EN 1385 whitewater safety standard. ●Ear protectors prevent ears from scratch and don’t affect hearing. ●12 air vents system for breathing. ●The rivets of Tontron water helmets are made of stainless steel, which has been tested by salt spray. It will not rust or fall off when exposed to water. ●Adjustable back of head dial.X-Large(23.6-24.4in)|(60-62cm).Large(22.8-23.6in)|(58-60cm). Medium (22.0-23.6in)|(56-58cm). Small(21.3-22.0in)|(54-56cm) .Helmet weight:460g. ●Suitable for whitewater kayak, rafting, SUP, canoeing,surf,kitesurfing,kiteboard and other watersports.