The Giro Vanquish MIPS Helmet streamlines airflow to reduce drag with its new Transform Air design. It also comes equipped with MIPS (Multi-directional Impact Protection System) technology, a unique system that reduces rotational forces during certain impacts. The Construction with EPS Liner and Progressive Layering adds a notable degree of comfort to your safety, and the Roc Loc Air MIPS Fit System is easily adjustable with one hand for simple, yet effective ventilation. A convenient Stealth Shield Dock holds the Magnetic Vivid Shield (by Zeiss) when not in use—plus, odor-resistant padding eliminates odors from forming. This sleek helmet weighs only 305g without the shield (355g with the shield). Sizing: Small: 20’’-21.75’’ (51-55cm), Medium: 21.75’’-23.25’’ (55-59cm), and Large: 23.25’’-24.75’’ (59-63cm).