The Bluegrass Super Bold, its realm is in the park and its limit is the sky. Highly durable and excellent abrasion sturdy, the ABS polymer outer shell is particularly well-suited to intensive use. One-piece thermoplastic construction. Occipital fit system provides a 360 degrees retention band that ensures that the helmet is held firmly on the head whatever the situation and even when doing the most acrobatic tricks. It is easy to adjust the size using a one-hand dial at the back of the helmet. The internal mechanism was designed for precision and reliability.