Sport Bifocal Reader Sunglasses for Men and Women. Semi Rimless Frame with Z87 Safety Lenses. composite frame Composite lens non-polarized Lens width: 60 millimeters TR90 SUPER DURABLE THERMOPLASTIC FRAMES  Tired of broken sunglasses? These Bifocal glasses are made of TR90 thermoplastic. Thermoplastic is a Swiss technology that offers extreme stress and crack resistance, flexibility and an incredibly smooth finish. TR90 is extremely durable, flexible and light weight. Its also extremely heat resistant, so you don't have to worry about the frames melting, getting sticky, or getting too hot under the sweltering sun. INCREDIBLY FLEXIBLE FRAMES & NOSE PIECES  These bifocals are extremely light and flexible, so they conform nicely around your head. You can wear these pairs for hours while playing 18 holes of golf and not even notice they are on. Soft rubber nose and ear pieces prevent slippage, so these readers are perfect for cycling, running, tennis, baseball, motorcycle riding and golf. IMPACT RESISTANT Z87 SAFETY LENSES  No matter what you plan on wearing sunglasses for, eye protection should always be a priority. These lenses are constructed of ASIN Z 87 certified safety polycarbonate lenses. They are virtually unbreakable and extremely scratch resistant. Have you tried to break a CD (compact disc) before? It cant be done! CDs are made of polycarbonate. The bottom line is, your eyes are worth every penny you spend on sunglasses. OPTICALLY CORRECT READING LENS  Optically corrected lenses provide accurate reading powers with no distortion. So, if you look at a straight line, the line will be straight. Lenses provide 100% UV protection and also scratch resistant. Available in the following magnification powers: +1.50, +2.00, +2.50 or +3.00.. NEAR INVISIBLE BIFOCAL LINE: Everyone will need to wear bifocal eyewear at one point in their lives. But does the whole world need to notice those unsightly bifocal lines? The magnified reading area at the bottom of the lens is injection molded, which means you cant feel the bifocal line on the lenses. The front of the lens is smooth, like nothing is there. Its nearly invisible. Its visible from the back of the lens, however, but not so much on the front of the lens.