Hat Head Tube

How would I go about making a mold of the shape of my head?
I have seen several You Tube videos of hat makers "Milliners" make blocks for their hats. I need an exact mold made of my head in order to create the block for a hat made for the shape and size for me.
try this:
http://www.ehow.com/how_4912680_mold-head.html?ref=fuel&utm_source=yahoo&utm_medium=ssp&utm_campaign=yssp_art



US $3.99