These Glasses feature enhanced color contrast, increased depth perception, it reduces glare, sharpens details, has 100% UV A, B, C protection and provides flash mirror with TAC-Tical polarized lens. Part of the Speedline collection this group features a nylon wrap frame made of Grilamid a Swiss polymer known for its flexability and durability. It also features Monel Metal wire frames. Monel Metal is a high quality optical material developed in the aircraft industry. Sunglasses in the Speedline collection resist slippage caused by lotion and sunscreen, features spring hinges, hydrophilic silicone temple boots and nose pads, and RX-able or prescription friendly frame options.