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 Interchangeable Lens Technology Tifosi Optics Interchangeable sunglasses feature decentered shatterproof polycarbonate lenses to virtually eliminate distortion, give sharp peripheral vision, and offer 100% protection from harmful UVA/UVB rays, bugs, rocks, or whatever