The 509 Sinister MX6 Lens is offered in multiple weather-specific tints so you can adapt your 509 Sinister MX6 Goggles to any condition. Swapping lenses on the go has never been easier with the Sinister MX6’s quick-latch system. The lenses are designed for dirt with an extra-tough anti-scratch outer coating, internal anti-fog coating, and super-wide field of vision.