Nutcase Island Sunset Street Bike Helmet Adjustable spin dial (which is removable) and two sets of foam pads work together for a perfect fit MAGNETIC BUCKLE and a soft chinstrap makes one handed operation easy and means no pinching of your neck 360 DEGREE REFLECTIVITY from logos, straps and our spin dial get you seen at night and a DETACHABLE VISOR keeps the sun and rain out of your eyes ABS shell with EPS inner foam lining meets both CPSC (for cycling ages 5+) and ASTM-F1492 (for skateboarding & trick roller skating) certifications 11 vents plus interior air channels move air around your head keeping you cool as well as looking great