Optimus Prime Muscle Chest Toddler Costume - Toddler Small The Optimus Prime Transformer muscle costume includes the jumpsuit & soft fabric headpiece. The Optimus Prime Muscle Chest comes in toddler sizes Toddler Small, Toddler Large, Toddler Medium. A fun musclular chest is built right into this Optimus Prime Transformers costume for toddlers. This Optimus Prime Muscle Chest 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.