The Smith Cheetah Sunglasses don't increase our speed, but they do amp up our look. The polarized technology reduces glare, while the carbonic lenses correct light distortion, offering superior optical clarity. These lenses are also engineered to be the most impact-resistant in the world, so they're perfect for keeping up with our active lifestyles. The cellulose propionate frame is lightweight and durable. The adjustable wire-core temples provide the comfortable fit we expect from Smith, and the cat-eye frame shape boasts the retro style we look for when we're on the prowl for a good time.