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 pieces for a customizable, comfortable fit.Tifosi Optics Polarized lenses offer exceptional strength compared to acrylic polarized lenses and superior optics to traditional polycarbonate lenses. Tifosi Optics new polarized lenses are injected at high pressure to increase optical clarity and decentered to eliminate distortion. The result is a shatterproof lens that reduces glare and offers unsurpassed optics.