No monkey business allowed with this huge primate. The Goin’ Bananas gorilla costume set features a Big Mouth Mask with mouth opening action. It comes with a fur jump suit and a pair of gorilla gloves and shoe covers. The Big Mouth Mask is two connected pieces. The lower jaw piece lays on the chest while the top is worn around the head. Nodding your head makes the mouth move. Fits men’s standard one size.