Stay safe with the S21 Series from MCR Safety. Accidents happen when people take off their glasses, but with these sleek, style-conscious safety glasses you'll wear them all day! The S21 features a frameless lens design that will allow an unobstructed view, metal temples and non-slip temple sleeves. The S21130 is made with a 3.0 filter lens for light torching and brazing. The Choose the best safety glasses, choose MCR Safety!