Giro's Register combines a helmet essentials: a lightweight construction and enough vents to cool you down during long efforts. Its sleek design doesn't slow you down because Giro knows you always appreciate the extra help. It is made in a comfortable Universal Fit size that can suit a multitude of head. It features a convenient Roc Loc Sport Fit adjustment system that adjusts with a simple turn of the dial so you can tune the fit in seconds and be ready to go. MIPS Register models also have an integrated Multi-Directional Impact Protection System, which can redirect energy and provide more protection in certain impacts.