The Smith Cheetah Sunglasses won't increase your speed, but they will amp up your look. The polarized technology reduces glare, while the carbonic lenses correct light distortion, giving you 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 your active lifestyle. The cellulose propionate frame is lightweight and durable, so whether your schedule has you on the move, or in relax mode, these sunglasses are good to go. The adjustable wire-core temples give you the comfortable fit you've come to expect from Smith, and the cat-eye frame shape gives you the retro style you're looking for when you're on the prowl for a good time. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.