The Tifosi Veloce Sunglasses with Interchangeable Lens are made of Grilamid TR-90, a homopolyamide nylon characterized by an extremely high alternative bending strength, low density, and high resistance to chemical and UV damage. Hydrophilic rubber ear and nose pieces for a no-slip fit. Adjustable ear and nose pieces for a customizable, comfortable fit. Vented lenses improve air circulation, prevent fogging. This frame is compatible with theVeloce Rx adaptor.Tifosi Veloce Sunglasses with Interchangeable Lens FeaturesFrame Type:Open LensWeight: 24 gramsFit:Medium,SmallRx Compatibility: Direct FitPRODUCT DETAILSAdjustable Ear PiecesAdjustable Nose PiecesCase IncludedGrilamid TR-90Hydropholic RubberPolycarbonate LensesUV ProtectionVented Lenses