The Bollé Mute freestyle helmet meets all your expectations thanks to its injected ABS construction, which is particularly effective in absorbing multiple shock. It is well ventilated with openings on the top that ensure a constant flow of air into the helmet. As for the size adjustment, it is done with a wheel on the back for a quick and easy adjustment. The lining is removable and washable to ensure durability. It can even be used in the spring thanks to its removable earpads. Helmet Bollé ---Mute Grey White Matte