Extremely durable and with excellent abrasion resistance, the ABS polymer outer shell is particularly suitable for everyday use. "One Piece" thermoplastic construction. The fitting system provides a 360-degree retention band that ensures the helmet is securely held on the head regardless of the situation and even when performing the most acrobatic tricks. It is easy to adjust the size using a one-handed dial at the back of the helmet. The internal mechanism was designed with precision and reliability in mind.