[HELMET SIZE]: This bicycle helmet is designed for adults; suggested age range: adults with large head size; suggested head circumference: L 58-61cm(22.8 to 24inches),XL 61-64cm(24 to 25.2 inches).To determine the correct helmet size, please wrap a measuring tape around your head, the tape should rest 1.5cm above your ears and remain level around the circumference of your head. [PROTECTIVE]: Made of a reinforced ABS shell and thickened shock-absorbing EPS core, it is comfortable and impact-resistant and meets the US GCC/CPSC 1203 /ASTM F 1447 adult bicycle helmet and EU EN 1078 bicycle helmet standards. [MULTI OCCASION USE]: This FASHION URBAN STYLE adult bicycle helmet is perfect for a variety of outdoor activities, including commuting, skateboarding, skating, scootering, longboarding, and road-biking.