TONIC RUSH MATTE BLACK PHOTOCROMIC GREY GLASSWith subtle contours and curved edges the Rush range stands alone in functionality and style. These sturdy yet light weight frames will suit finer features to ensure that you never miss a moment in the great outdoors. Frame: Matte Black Lens: Glass Grey Photochromic TONIC Glass Photochromic Lenses, Copper or Grey, darken and lighten depending on ambient light conditions. These lenses have been designed and developed to give the highest quality optics