integarated encirling type design gives flank protection,shows eleglance an decentness;the length of temple can de adjusted in 4 different positions,temple line can be added for easier and safer use;resists scratch and static,absorbs over 99.9% harmful UV;lenses can be conducted the coating treatment including filming,fog resistance,enhancement,etc.to satisfy different working conditions;this product conforms to America ANSI Z87.1 and EU CE EN166.