The Leonard Series was designed to have a classic and stylish look. All Leonard's are made with spring hinges that allow the arms of the frame to bend an additional 30 degrees outward. This prevents the uncomfortable squeezing pressure above your ears, providing more stretch for the best comfort possible. All of our glasses are made of a high quality polycarbonate. This means they are lightweight and durable, and provide 100% protection from the suns harmful UVA and UVB rays.