The 509 Sinister MX6 Fuzion Flow Lens is offered in weather-specific tints so you can fine-tune your 509 Sinister MX6 Fuzion Flow Goggles for any condition. Our industry-first Fuzion lens technology enhances clarity and maximizes field of view by fusing Super Anti-Fog inner and outer lenses into one optically clear, ventless construction. It's a combination of performance that has taken the high-octane trail riding world by storm. Swapping tints is easy with the Fast Lens Loading System.