NIKE EV0937-010 cross Trainer sunglasses matte crystal Wolf Grey/White, grey w/Silver Flash lens features NIKE max optics lens technology for precise visual information at all angles of view. These cross Trainer sunglasses have a lightweight 8 base injected frame design. The auto-adjusting ventilated nose bridge is for a customized fit and added grip. Cam-action hinges snap firmly into place. Interchangeable lenses are available, but must be purchased separately.