Bobster Eyewear Road Hog II Convertible and Interchangeable SunglassesFeatures the patented QRS for quick conversion from sunglasses to goggles and 2 easily attachable detachable foam inserts Frames are molded from the Swiss material Grilamid which is lighter, more flexible and more durable than conventional plastics Kit includes 4 sets of easy to change lenses, Anti fog smoked, amber, clear and dual grade reflective Polycarbonate lenses are shatter resistant and provide 100% protection against UVA and UVB ultraviolet