As the name suggests, the Roc Loc Air retention system is lightweight and low volume. It provides proper fit and support in a hyperlight, but durable design, and made for any non-MIPS Synthe. It is most easily identifiable by the simple and effective rear thumb dial, which improved fit from the the older two-button system and enabled Giro to reduce weight. A properly functioning fit system means comfort and effective retention, both of which improve rider safety.