One of the most important characteristics of any spectacle frame and sunglasses is the material which they are made of. The main advantage of plastic frames is hypoallergenic, as well as a wide palette of colors and shapes. For many years, cellulose acetate has been a leader among plastic options. Customers appreciate models from acetate for convenience, lightness, and also because they are pleasant to the touch and are presented in all price segments. These advantages overlap the fact that plastic has low resistance to UV radiation and chemical influences, which is why it quickly fades. Plastic frames break more easily than metal frames and with time their strength may decrease a bit.A more expensive alternative is carbon, which is not only unusually lightweight, but also resistant to external influences. For making fashion sunglasses designers prefer carbon. This plastic material provides the opportunity to create flexible and elegant products of the most unusual design. The most popular epoxy polymer is optyl. It is resistant to ultraviolet, cosmetics and sweat. In addition, it again takes its previous shape after deformation.