Tifosi Jet, Gloss Black Sunglasses are made of Grilamid TR-90, a homopolyamide nylon, which allows for tremendous bending strength and has high resistance to UV and chemical damage. Features: For a no-slip fit, this durable eyewear set has a hydrophilic rubber nose piece and ear pieces. Lenses: GT lenses. Weight: 29 grams. Fit: Small to Medium