I have the official stain-prevention tape on my forehead, but I haven't sweated much, so I think the inside of the hat is clean. However, I've also worn it to a dog park, so the outside has a dusty feel. It might come off with hat cleaning, but please understand that. I liked that the brand logo was black silver instead of the usual silver. Purchased at Ginza SIX. I think it cost around 30,000 yen at the time of purchase. - Brand: KAMINSKI - Material: Cotton - Color: Black - Inner design: Check pattern Thank you for looking.