Bobster BRH2001 Road Hog II Prescription Ready Sunglasses,Black Frame/4 Lenses (Dual Grade Reflective/Smoked/Amber and Clear),one size CONVERTIBLE FROM GOGGLES TO GLASSES: Bobster convertibles are stylishly sleek and versatile. The Road Hog II has the ability to easily convert from sunglasses to goggles. Our convertible eyewear is for those that desire the look of a sunglass and the functionality of a goggle. By simply removing the temples and inserting our goggle strap, Bobster convertibles seamlessly transition into goggles INTERCHANGEABLE LENSES: Interchangeable lenses can be easily changed out by removing the lens from the eyewear frame and inserting different colored lens into the same frame. The Road Hog II comes with 4 lenses: Dual Grade Reflective, Smoked Mirror, Amber and Clear IMPACT RESISTANT UV PROTECTION: Our Polycarbonate lenses are up to 10 times more impact-resistant than plastic or glass lenses and they also provide 100% protection from the sun's harmful UV rays. They are also lightweight, adding to the comfort of your eyewear CLOSED CELL FOAM: The Road Hog II also comes with 2 sets of removable closed cell foam to ensure a tear free ride while cruising. This type of foam provides low water absorption while being weather and chemical resistant. It also lasts longer than most other foams OPTICALLY CORRECT LENSES: Optically correct lenses prevent headaches from extended wear of eyewear. Non-optically correct lenses cause continuous refocusing due to distortion. This places a large amount of strain on the eyes and can eventually lead to headaches, nausea and dizziness. Lenses are Prescription ready (Rx-able) MEDIUM FRAME SIZE: Frame Width - 130mm, Lens Width - 49mm, Lens Height - 31mm. Comes with protective carry case.