Bolle Sport Cobra Sunglasses Finest grade nylon is utilized in our frames to create lightweight, incredibly durable and ultimately flexible frames. Comfortable hydrophilic nose pads and temle tips keep sunglasses firmly in place. Lightweight, premium-grade resin that's 20 times more impact resistant than glass-and three times lighter Armor shell on both sides of the lens to protect against scratches. National Sun RX Program offers patients a precise fit and a broader more accurate field of view.