There is a wide variation of designs, colors and materials used in eyewear industry. Plastic frames are produced from a range of plastics such as cellulose acetate, cellulose propionate, polyamide, nylon, and others. Nylon is a material which is easy to mold thus it is widely used in cases where a certain shape of the frame is difficult to obtain using other materials. It is believed that frames from nylon are very practical as the material easily bends and returns to its original position. And though Nylon eyeglasses are lightweight, flexible and mostly durable and strong, it is better to use nylon frames with the metal base inside the plastic. Nylon material can be coated with many different colors and it is often used for manufacturing of sport glasses and fashionable wrap-around models. Nylon frame is an indispensable accessory for outdoor enthusiasts, especially for fans of motorcycle and skiing as it can successfully withstand heat and cold and it scratch resistant. Nylon has become a premier material for sports and performance eyewear due to its impact-resistant properties.