you can't, but wearing two caps helps a little bit
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A person can shrink their FlexFit hat by soaking it in hot water for several hours. The brim of the hat should not be soaked.
Wool shrinks when it is agitated in hot water. You may not be able to control how much the cap shrinks.
That is a very bad idea. It will probably be very unreliable. It would be prone to breaking.