Optimus Prime Muscle Toddler Costume - Toddler Medium This Optimus Prime toddler costume includes a jumpsuit with muscles and soft headpiece. This Optimus Prime toddler costume comes in toddler sizes Toddler Medium, Toddler Small. This Optimus Prime toddler costume is an officially licensed Transformers costume. Please note: This item's color may vary due to inherent manufacturing variations or your computer monitor's color settings. The item you receive will be identical or substantially similar to the item pictured in this listing.