FrameGuarde Eyewear Retainer Set of 4 (for 2 Sizes of Frames) US Made Hypo-Allergenic Surgical Grade PVC Tubing Innovative, spiral-based design provides a long-lasting & snug fit for most eye glasses Slips snugly behind ears to prevent glasses sliding and slipping forward 2 sizes included fit most glass temples; no adhesive, chemicals or fasteners required Stays on for longer; almost invisible; no cords or straps, and its quite comfortable!