Sunwise Interchangeables have a variety of durable, lightweight, comfortable, secure-wearing models and are a proven best-seller. Each frame includes two extra sets of high definition, lightweight and shatterproof polycarbonate lenses, to ensure the very best in visibility whatever the light conditions. The frames are flexible and lightweight, making it easy to change the lenses. 3 levels of lense-cuts over the various models offer you style as well as maximum protection coupled with levelled air-flow technology