Equipped with 12 vents to rapidly dump fog-producing moisture, the 509 Sinister X6 MaxVent Lens is a must for riding hard on mild or humid days. A range of weather-specific tints enhance vision in low-light or bright conditions. Like all Sinister X6 lenses, the MaxVent is easy to change thanks to the Fast Lens Loading System and maximizes peripheral vision with a super wide field of view. Industry-leading optics provide the ultimate in anti-fog and anti-scratch coatings.