Bifocal Reading Sport Wraparound Sunglasses Lightweight for Men and Women.Cycling, Running, Fishing, Golf and Driving composite frame Composite lens non-polarized Lens width: 70 millimeters Lens height: 39 millimeters Bridge: 19 millimeters Arm: 120 millimeters HIGH QUALITY FRAME - Super durable thermoplastic TR90 Frame is a Swiss technology, known as a thermoplastic. TR90 Thermoplastics are incredibly durable, flexible and lightweight. This cutting edge material is also heat proof, so you don't have to worry about wearing them melting, getting sticky, or getting too hot under the sweltering sun on the beach. Available with classic black, sleek grey and titanium brown frame option. PREMIUM IMPACT RESISTANT POLYCARBONATE LENSES - Poly what??? proSPORT bifocal reading glasses are built to withstand the elements. Polycarbonate is shatterproof, scratch resistant and the absolute best material for eye protection. OPTICAL READING GLASSES - proSPORT bifocal glasses are equipped with optically corrected lenses, and provide accurate no distortion reading powers. The bifocal is perfectly placed for clear vision. The wholes lenses are also protected from harmful UV A and UV B rays. Magnifying portion on the bottom lens is nearly invisible, so people will not notice that you are wearing bifocal sun readers. COMFORTABLE FIT - The flexible and light TR90 frame will conform around your head perfectly. You can wear this bifocal readers for hours playing an entire 18 holes of golf, motorcycle riding and fishing for an entire day. Soft rubber non-slip nose pieces make these glasses perfect for all outdoor activities such as cycling, tennis, baseball, golf, running, driving and walking. Fits medium head sizes. WHAT ARE BIFOCAL SUNGLASSES? Bifocals are glasses with a distinct magnified area at the bottom 1/3 of lens. Since these are bifocals that dont require a prescription, the top area has zero magnification. When looking through the bottom area of the lens, smaller items like print copy is magnified for easier reading. Bifocal eyewear helps with Presbyopia, which is the inability to see objects that are close up. When looking straight ahead, the vision is normal.