The Joker's Thugs were a gang of criminals, in part a combination of small-time robbers, bounty hunters, shanghaied gangsters, and mentally-ill escapees of Arkham Asylum, who served under the Joker. Because of the Joker's appearance, most of the thugs wore clown masks and similar apparel.
Half mask. One size fits most adults.
This is an officially licensed Batman ™ product.