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A mere observation
After a camp and ride in Maine we had gone riding on very dry dirt roads in a fog of micro dust which penetrated everything
So everything needed cleaning including the helmet at Shoei rf1200
Well after the shampoo the padding, and washing the shell, a nice dry and a spritz of fabreeze
When I put it on it now feels a little tight like when new, this the third time I have noticed this.
I have heard others say they thought it was time for a new hat as this one was feeling loose
I am sure the human spooge that collects in the foam must glue some of the padding together so it effectively shrinks