proSPORT Bifocal Sunglasses Readers with Sporty Wrap Around Half Frames for Men and Women Unisex. plastic frame Composite lens non-polarized Lens width: 71 millimeters FLEXIBLE FRAMES & NOSE PIECES  These bifocal glasses are extremely lightweight and flexible, so they conform nicely around your head. You can wear these bifocal eyewear for hours while playing 18 holes of golf and not even notice they are on. Soft rubber nose pieces prevent slippage, so these bifocal glasses are perfect for cycling, tennis, baseball, running, motorcycle riding, driving and golf. 100% UV PROTECTION: Always wear sunglasses with 100% UV protection. Sometimes you will see UV400 protection which means the lenses will block UV light up to 400 nanometers (all UVA & UVB rays) on the UV spectrum. Prolonged exposure to the suns harmful UV rays can cause cataracts, pterygium and corneal sunburn. NON-SLIP RUBBER NOSE & EAR PIECES: If you want to be on top of your game, you need sunglasses that dont slide down your nose, or fly off in the wind. If you to start to sweat, ordinary plastic nose pieces can hinder your performance. Rubber nose and ear pieces are soft and comfortable. Spend more time focusing rather than adjusting with these sunglasses. 180 WRAP PROTECTION: In order to block UV rays, wind and debris from all angles, you need sunglasses with 180 wrap protection. If the sun is behind you, flat lenses dont block UV rays that bounce off the inside of the lenses into your eyes. Flat lenses also dont seal out wind or debris that can cause temporary blindness. So, wrap frames offers protection that keep your eyes comfortable and safe. NEAR INVISIBLE BIFOCAL LINE: Everyone will need to wear bifocals 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.