Ray-Ban RB3721CH Chromance is a modern, square-shaped metal frame that brings style and sophistication to any look. These sunglasses feature a polished black on silver frame with chromance blue lenses, which offer the ultimate in color vibrancy and clarity thanks to their polarized treatment. The squared shape adds an extra touch of attitude to these shades, so you can be sure they'll turn heads wherever you go. Available with lens contrast enhancement technology.