Made in a comfortable Universal Fit size with our convenient Roc Loc Sport fit system, the Register adjusts with a simple turn of the dial so you can tune the fit in seconds. Meanwhile, a range of colors lets you choose exactly how your on-bike style comes together. The Register MIPS helmet also has an integrated Multi-Directional Impact Protection System, which can redirect energy and provide more protection in certain impacts. Giro Cycle - Register MIPS Helmet