Reevu Replacement Visor for FSX1 Rear-View Motorcycle Helmet - Smoked Patented rear-view technology with a mirror system that essentially bends the light around the shell of the helmet, offering a clear view of what's behind. Tri-composite carbon fibreglass, Kevlar and synthetic hi-tenacity advanced fibre shell Fully removable and washable liner Anti-fog face shield Sizing Chart: Measure around your head: XS = 50-54 CM S = 54-56 CM M = 56-58 CM L = 58-60 CM XL = 60-62 CM XXL = 62-64.5 CM