Poor Optimus Prime. Not only does he have to save the universe from the Decepticons, but he has to look out for those mean, angry, and downright unappreciated humans as well. Do your part to save humanity this Halloween in a simple, easy-to-wear Optimus Prime Halloween costume. Set includes printed shirt and mask. Care: 100% polyester. Hand wash cool, no bleach, line dry, cool iron. Available in adults' X-large (42-46) and XX-large (50-52).