Ray-Ban RB3684 Gradient Glass Sunglasses are made to break boundaries. Featuring glass construction for the clearest vision, the gradient lenses in these Ray-Ban RB3684 sunglasses are characterized by a smooth transition from a solid color to a transparent shade of the same color The frames are built from metal and PEEKa special semi crystalline thermoplastic that marries excellent mechanical strength and good dimensional stability. The result: lightweight frames that hold up well to hard use. These Ray-Ban gradient sunglasses come with a cleaning cloth and case. Manufacturer style #: RB3684. Glass mirror lenses virtually eliminate glare Gradient lenses transition smoothly from solid to transparent 100% UVA and UVB protection Metal and PEEK thermoplastic frames for lightweight strength Rubberized, contoured temple tips for a secure, comfortable fit