Expanding on the long heritage of our Sinister MX-5 Goggle. Featuring a removable nose mask, better field a vision with Phantom Frame Technology, and fog free lens technology with added airflow to keep you cool in the hottest of conditions. Ready to go no matter the conditions, the 509 Sinister MX-5 Enduro is compatible with any MX-5 dual or single pane lenses, making this the goggle that can go with you all year long.