Corrente provides excellence without question. Polar PhD lenses are clearly superior delivering a high definition view. Nylon half rim frame technology offers a comfortable and lightweight fit for a trusted performance with unmatched durability. For ultimate performance, the moisture absorbing nose pads keep frames in place for every destination you may travel. All Serengeti lenses offer the latest in photochromic technology, which constantly lightens and darkens throughout the day to ensure you see every detail.