This is the bicycle helmet that folds to 1/3 of its size for easy storage in a backpack or purse. Its unique design allows it to easily fold by unlocking its hinges, then sliding and flipping its four different sections. It has a durable ABS outer shell and an inner shell made of expanded polystyrene foam for enhanced protection. Three included pad sets enable one to adjust the helmet’s fit. With 14 ventilation holes, adjustable straps, and chin protector.