The Masuri Vision Series Test helmet is built for a high level of impact protection and comfort. Strategically-placed vents in the inner and outer shells improve air-flow, and the new reinforced rim (HRS) minimises movement between the solid peak and certified steel or titanium grille, giving the Vision Series Test strong protection performance. - TITANIUM GRILLE The Vision Series Test model grille uses certified grade 5 titanium. It also incorporates advanced manufacturing techniques to give greater protection. HALO REINFORCEMENT SYSTEMMasuri’s Halo Reinforcement System (HRS) is an extra strength helmet rim featured on every model in the Vision Series. Made from the latest reinforced plastics, HRS significantly increases protection by ensuring minimal deformation of the helmet shell during impact. - AIRFLOWThe innovative 3-layer protection system incorporates strategically placed vents in the inner and outer shells and air channels throughout the cavity, allowing air to circulate freely at all times, keeping the wearer cool. - SIZES AVAILABLE Small men's 550-580mm - Standard 580-610mm Large 610-640mm