The Dirty Dog Sonic Polarised Sunglasses in Black & Ice is moulded from Grilamide TR90, a thermoplastic polyamide. The frames of the Sonic are lightweight and extremely flexible plus with 100% memory the frames will always bounce back to their original shape. Product Information: • Product Code: 53664-MB/GI • Moulded from Grilamide TR90 • Lightweight and extremely flexible frames. • 100% memory allows the frames to bounce back to their original shape. • Keeps its properties in extreme temperatures. • Made with the latest lens technology in Polarised Polyfilter lenses. • The Polarised lenses absorb radiation that can be damaging to the human eye.