The Register(TM) helmet combines sleek design and lightweight construction with features that complement your style, on the road or trail. Made with InMold Construction technology in a comfortable Universal Fit(TM) size, and equipped with Giro's convenient Roc Loc(R) Sport system, the Register adjusts with a simple turn of the dial, so you can customize the fit in seconds. A range of colors from mild to wild lets you choose exactly how your on-bike style comes together to create a helmet that looks and feels like it was made for you. Polycarbonate shell. Lightweight yet rugged In-Mold construction. EPS foam liner reduces impact. Roc Loc Sport lets you get a close, custom fit with its dial-adjusting system. Removable Quick Link visor keeps the sun and the elements out of your eyes. Ideal for casual use and commuting. 22 sculpted vents enhance ventilation and disperse heat. Reflective rear accents keep you visible in low-light conditions. 21.25 - 24 in.. Imported.