Ray-Ban Round Double-Bridge RB3647 Glass Sunglasses shade your eyes in a way that exudes confidence and self-assurance. The addition of a full metal bridge span across the top brings a strongly cohesive presence to a time-honored Ray-Ban style. These great-looking round sunglasses feature glass lenses affixed to a sturdy all-metal frame. Irresistible, contemporary styling with unisex appeal. Imported.Manufacturer style #: RB3647. Confident and self-assured Full metal bridge span Iconic round glass lenses Sturdy all-metal frame Unisex styling About Ray-Ban lenses Classic: Created in 1937, the classic lens was originally developed for military use. Classic lenses are available in many styles, including the popular G-15 and B-15 lens. These lenses offer a high degree of clarity, comfort and protection, blocking out a majority of blue light and prevents 85% visible light from passing through the lens. Mirror: The mirror coating features an advanced technological coating to help reduce glare and increase contrast for greater visual comfort, while also providing a stylish look. Flash Mirror: The same great technological coating as the mirror lens significantly decreases glare, with an additional bold and stylized flash coating. Gradient: Gradient lenses are characterized by a smooth transition from a solid color to a transparent shade of the same color. Photochromic: Sensitive to light exposure and adaptable to every kind of environment. The UV400 protection ensures almost complete protection for the eye. (99%-100%).