Wolf's guenons are dark gray with a reddish saddle on the back. The under-parts are white or yellow, depending on the sub-species. The arms are black, the legs brownish red, and the tip half of the tail is black. The head has a pale brow and a broad band of black from the eye to the ear. The ear tufts are red or white. Their head and body length is 17.5 to 20 inches with a tail length of 27.4 to 32.4 inches. They weigh 5.2 to 6.9 pounds.