Anon built the Allie Sunglasses to last. They combined stainless steel hinges, durable acetate frames, & scratch-resistant lenses to ensure they can take hard use. The Optyx Descentered lens material weighs less than glass & resists wear better than polycarbonate. Anon didn't skimp on vision quality either. The Allie Sunglasses have tapered lenses to eliminate optical distortion, so you see the world as it is.