Introducing the ALL NEW Sinister MX-5 premium motocross goggle. This ultra high end dirt goggle was born from our best selling snow goggle, the X5. Featuring the same goggle frame, we meticulously customized a dirt specific single pane lens with tear off posts and a sleeker, rigid removable nose mask. We also lined the frame's air ventilation ports with a summer specific higher flow foam material. This foam technology allows maximum air flow while keeping small dirt & dust particles out. The single pane lens features a chemically bonded anti-fog & anti-scratch coating for maximum performance. The fixed edge pressure outrigger system makes for a perfect fit & seal with your 509 brand helmet. So long are the days of mix & matching two different brand dirt goggles and helmets. 509 Sinister MX-5 goggles and 509 brand helmets are a combo designed to work in perfection.