Tri-Comfort: Small horizontal ribs between the frame and the skirt in the area around the nose. These ribs absorb and redistribute the pressure exerted by the frame onto the skirt, with a resulting increase in comfort.
Optical Lenses: Mares offers corrective lenses for most models. In addition to the negative diopters (-1 to -7), for some models also positive diopters are available (+1.5 to +3). Mares design makes it quick and easy to install lenses. Choose yournegative diopters lens for this model here:MARES OPTICAL LENSES X-VISION