Nutcase Atomic Boomerang Street Helmet, Medium 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 MAGNETIC BUCKLE and a soft chinstrap makes one handed operation easy and means no pinching of your neck 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 Adjustable spin dial (which is removable) and two sets of foam pads work together for a perfect fit