These black, unisex large gritted stretch devices have strap-on traction that is made of aluminum oxide/rubber. They are lightweight/compact that fit shoe sizes from 10 to 11.5 for men and 12+ for women. The devices have a patented trim line, ball/heel coverage, and non-sparking/non-conductive. They measure 11¾ length x 3⅝ width x 7 inches height.