Some horses are only allowed to eat a little grass due to obesity or medical reasons. With this muzzle, they can move freely with other horses in the pasture without overeating. Would you like to know which size you should choose for your horse? Check out the size chart. Composition: Polypropylene, thermoplastic elastomer. - Halter with muzzle for diet horses. - Adjustable in several places. - Comes with a ring for attaching a lead rope.