Crushable hats - Keep your hats dust free. We recommend a soft bristle brush for cleaning felt hats. Always brush with the nap in a counter clockwise motion. Ordinary dust marks and smudges may be removed with a hat cleaning sponge. Felt hats were not intended to be worn in the rain. However, if a hat does get wet, flip the sweatband outward, and set the hat upside down on its crown to allow it to dry naturally.