These black/white, unisex small safety overshoes are made of thermoplastic rubber. They are waterproof, oil/acid/crack/chemical-resistant, and meet CSA standards. The guards measure 13 length x 5¾ width x 4¼ inches height and weigh 28 oz. They fit shoe sizes from 8 to 9 for women/6 to 7 for men and have a flatter anti-slip sole.