“These hats through Melin are incredible, I have every color currently. I have a black one that I wear every day to the gym and slowly after over 2 years started getting sweat marks. I was told to was it in “clear” Dawn dish soap and let it soak over night. It cleaned it so well it looks like it’s completely brand new. I highly recommend Melin hats to anyone & everyone I meet. The “tech” they developed for a hat is impeccable to say the least.”