My nephew could not wait to get this costume on. He announced,"I AM OPTIMUS PRIME!" He is 4 years old but very tall for his age. He is not a chubby child, fairly thin. The costume fit perfectly. We liked that the material for the body is thin since we are in a colder climate he could easily wear it over a sweat suit. The arm piece was missing but they shipped it immediately. My nephew handed out the Halloween candy to trick or treaters and I was surprised at how many kids, even older ones told him, "Hey cool costume!" I am very glad I got this for him. He plays with it all the time.