This is a Columbia work cap. It's one size, and the size can be adjusted at the back of the cap. It also uses Columbia's proprietary Omni-Tech technology to repel rain and wick away moisture from your head. I bought it about 8 years ago. I think it was around 4000 yen at the time. I wore it a few times after purchasing it and have kept it stored indoors ever since. I've decided to sell it because I've had more opportunities to wear other hats. It's in good condition except for some discoloration on the size adjustment belt (photo 4). Please understand that this is a used item before considering a purchase.