| Polycarbonate was developed in the 1970's and utilized in the NASA Space Program. Its shatter resistant nature made it the leading choice for the visor on astronaut's helmets. With an index refraction of 1.59, polycarbonate is considered vastly superior to former widely used plastics. This material is made with 100% built-in UV blocking, eliminating the need to purchase a UV protection coat. Though considerably lighter and thinner than other plastics, polycarbonate is considered the premier choice for children and active adults. Its durability stands alone at the top of its class. |