Polaroid Pld 4076/F/S - Alternate Fit is a Full Rim, Alternate Fit/Low Bridge frame for Women, which is made of Metal & Plastic.  This model features a Rounded Edges shape, with a Single Bridge and Polarized lenses.  Alternate Fit frames have a specially designed bridge for those with higher cheekbones and wider nose bridges. Alternate fit ensures the frames rest on the nose and prevents sliding.