put it in the freezer...
i left my fitted in my car that was left in there for two weeks straight and due to the summer weather it was floppy and soft n shit so i threw it in the freezer to stiffen and it shrunk about a size
i dont know if it was the heat to the sudden cold, but the freezer will shrink it somewhat
um...i don't even know where to begin with this nonsense.
first off, wool doesn't just loose its shape from sunlight. it also doesn't "magically" snap back into shape when exposed to cold temperatures.
and "shrunk about a size"? i doubt that, if so you wouldnt even be able to get it onto your head.
just follow the guidelines listed on the new era website, and you'll be fine. any other hair-brain schemes you want to pull...do so at your own risk.