The 509 Sinister X7 Ignite S1 Snowmobile Goggles offer premium clarity and fog-free performance with their innovative Ignite heated inner lens. This feature uses an in-frame sensor to automatically monitor humidity and moisture, activating the heated lens and built-in fan to eliminate fog. The 509 Sinister X7 Ignite S1 also features a manual mode so that the user can adjust as needed. The goggles ensure an optimal fit and superior sealing with a hard lens frame, along with shuttered venting in the frame that can either scoop air in or close off flow. Plus, the soft goggle frame provides unparalleled comfort and fit, enhancing your snowmobiling experience. For comfort and protection, choose the 509 Sinister X7 Ignite S1 Snowmobile Goggles.