DID sunglasses DID is a versatile model for both casual & active use with a slim & lightweight frame injected in grilamide. The lenses are made in NXT a lens material that provides superior optical performance & protection. Treated with anti-scratch anti-reflective oleophobic & hydrophobic coatings. Uranium Black Hydrogen white Gold or Iridium red frame: grey lens VLT 15% &40; Cat 3&41;. Neutral tint that is relaxing for your eyes during long term use. Gadolinium brown frame: brown lens VLT 15% &40; Cat 3&41;. A contrast enhancing tint for better definition.