Moulded from Grilamide TR90, a thermoplastic polyamide. Jello JL501 Blue w/Yellow glasses online are lightweight, extremely flexible yet super strong with 100% memory allowing the frames to bounce back to their original shape. The rounded oval lenses are rimmed in a blue matte frame with vintage like key hole bridge followed by yellow temple pieces. You'll love the look and feel of them. TR90 has demonstrated no risk of allergy and is FDA approved.