Finest grade nylon is utilized in our frames to create lightweight, incredibly durable and ultimately flexible frames. * 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. * LIMITED EDTION. All purpose Grey Lens. Neutral. Fit 7-10 Years