The Piraja, part of Bolle's Snakes Collection, named for its wrap around style that holds tight with high performance polycarbonate lenses that are lightweight and shatter resistant. And thanks to the inlaid, non-slip Thermogrip temples and nose pads, they stay on whether you compete for pay or play. Medium/large fit. 100% UVA/B protection. Polycarbonate (PC) lenses are super lightweight, premium-grade plastic resin lens which are 20 times more impact resistant than glass and a third of the weight. Exceed ANSI requirements for UV protection for impact resistance and optical clarity. Carbo Glas coating, an industrial strength coating, is applied to both sides of the lens for greater scratch resistance. Anti-reflective (AR) coating because glare comes from two directions. This scientifically engineered coating on the backside if the lens eliminates backside glare to reduce eye strain. Nylon frame made from the purest high grade nylon in manufacturing superior, lightweight, flexible fra