100% safe, shatter-proof plastic assembly with a flexible, ergonomic fit for different face shapes. There are no metal parts, thus reducing the risk of injury. The polycarbonate lenses offer 100% protection from UV rays and category 4 blue light, and are highly impact-resistant. An adjustable and removable elastic band keeps the glasses on the face. These reasonably priced sunglasses are available in several different colours. The manufacturing process reduces the number of injected materials by relying on the mono-injection of Hytrel.