At The Sunglass Fix we know how important great optics are in a pair of Red X sunglasses. That is why we have developed precision Polyamide lenses with the optical clarity of glass. We strive to make our lenses as good if not better than your original Red X lenses. You have taken the time to find a pair of Red X sunglasses you love. We are here to make sure they look as good as the day you bought them.