Bolle Zander (Polarized A-14, Dark Tortoise) Plastic B20.3 Polycarbonate Lenses are 20x more impact resistant than glass and 3x lighter CarboGlas Coating gives an armor shell from scratches and abrasions b88 frames are made of the finest grade nylon for incredibly lightweight, durable, flexible frames ThemoGRIP comfortable hydrophilic nose pads and temple tips keep the sun glasses in place Pin less Hinges connect temples to frame fronts seamlessly without parts that are prone to break down over time