Inside of Pan's head has a small amount of poly foam, not that much though. In the back of the head where the hair is, under the skin is electronics that operate the ears to move, and the eyes to blink. You see though Pan's tear ducts. There really wasn't much poly foam used for him though.
There was a lot of materials that were used for the making of Pan's body, to much in my opinion. I will most likely post something on my profile or a tutorial on Youtube on how to make him. I'll still put down the materials that were used in every step towards building Pan.
So, if I may ask, what did you use for the make up of the body?
And again, this really beautiful!