Simply attach to any hat by peeling off the backing from the adhesive on the back, and press into the sweatband of your hat. It should stay securely attached for regular wear. This guard will also act as a size reducer, to give your hat a more snug and secure fit.
This product would be ideal for individuals who frequently wear hats, are concerned about sweat stains, and desire a space-saving solution for their existing sweatbands.