Classic retro-square wire with spring hinges and polarized lenses. Frame: Durable, light weight aluminum with newly engineered "Suspension Spring Hinges" (SSH) for an exceptionally comfortable fit. Lens Coating: micro-thin, multi-layer "Titanium" coatings from the latest technology. This advanced lens provides for 100% protection from UVA, UVB and short wave blue light rays, as well as, increasing visual clarity and enhanced detail with sharper focus. This advanced coating with poly-carbonate lenses creates a lens with the greatest impact resistance and optical clarity that exceeds all ANSI standards. Lens Base: Six base curve lens with zero distortion, reduced peripheral light and glare, and greater depth perception.