103157RED000 Features : Shock from falling debris will by absorbed by the durable polycarbonate shell Keep your cool with the 14 ventilation holes while your is cushioned by the 2 foam headbands Adjust the headband fit with the adjustment wheel while you adjust the position of the strap at the nape of the neck with a second adjustment wheel Slide the position of the chin strap forward or backward Specifications : Weight : 156 ounces Head circumference : 21-25 inches