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 foggingtifosi fototec lenses lighten and darken automaticallyweight 24gfit s mframe type open lensrx options direct fithydrophilicvented lensadjustable ea