This helmet is the ideal safety equipment that you have been looking for to accompany you on your rides. The adjustable spin dial located towards the rear of the helmet allows for a precise snug fit. Foam pads inside the helmet provide additional comfort for the user. The built in ventilation system with 13 air vents ensures that air flow is present throughout the shell to help control head temperature. A high-reflective print design increases visibility after dusk. The black nylon strap is easy to adjust the size with the double-injection ring. Ride safe. , , Size Guide:, Small (54-56cm), Medium (57-59cm), Large (59-61cm)