The Dirty Dog Sonic Polarised Sunglasses in Crystal Black & Grey is moulded from Grilamide TR90 a thermoplastic polyamide. The frames are lightweight, strong and extremely flexible plus with 100% memory they will always bounce back to their original shape. Product Information: • Product Code: 53665-CB/GY • Moulded from Grilamide TR90 which is a thermoplastic polyamide. • Lightweight, flexible and strong frames. • The frames have 100% memory which allow the frames to bounce back to their original shape. • The latest lens technology in Polarised Polyfilter lenses. • The Polarised lenses absorb radiation that can be damaging to the human eye.