The stylish Perspecta 1900 lenses provide clear panoramic view. Due to straight shackles, which is produced by joint injection of two materials method (with ability of fixing the adjustment of length and inclination) the glasses are almost not felt during wearing (weight of glasses is just 27 g). Transparent lenses are available in a black frame, light golden mirror lenses and dark brown lenses in a red frame. Tested at -40ºC.