Cannondale 2018 Radius MTN Mountain Bicycle Helmet - CH4607 Multi-molding Polycarbonate shell technology bonds the outer shell with the EPS shell for one-piece 22 Flow Through vents control comfort by maintaining airflow through the helmet Heat sealed moisture wicking pads keeps the sweat under control System Integrated micro dial fit w/ Ergo-fit EVA occipital pad offers a precise fit Removable visor