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 tifosi fototec lenses lighten and darken automaticallyadjustable temples and nose pieces for custom fit vented lenses improve air circulation prevent foggingweight 26gfit m lframe type full framerx options directfit insertadaptors