Model specifications bronxframe type full frameweight 29 gramsfit large mediumrx compatibility directfit frame features fully wrapped and aero dynamic bronx offers full coverage and durable comfort also available in the tactical collection 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 all tifosi optics eyew