WATER SPORT HELMET: Keep your noggin protected with this 1-size-fits-such a lot helmet for whitewater kayaking, rafting, and other water sports 1 SIZE FITS MOST: Fits head circumferences between 20.8 and 24.4 inches ADJUSTABLE: Simple to regulate with a easy twist of the ratchet-adjust DialFit system COMFORTABLE: Keep relaxed and dry with plush FIT pads, adjustable chin strap, and 6 ventilation/drainage ports that permit air in and water out SAFE: Have an effect on projection from lightweight and sturdy ABS plastic shell and EVA foam liner; Meets CE 1385 standards for whitewater safety