The innovative Smart Film by Armor Vision, featuring hydrophobic properties and an ultra-hard coating, is a true industry game-changer. Mud, dust, and sand that normally adhere can be easily wiped off under nearly all conditions. Tested and approved by top athletes around the globe, with more joining every day. Size Guide: The 36-mm Smart Film is designed to fit most smaller-framed glasses and youth eyewear. Care Instructions: As with all coated lenses, clean only with warm water to avoid damaging the coating.