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 damagehydrophilic rubber ear and nose pieces for a no slip fitadjustable ear and nose pieces for a customizable comfortable fitsmoke477 152 light transmissionneutral smoke tint does not distort colorsideal for bright sun100 protection against harmful uvauvb rays