This is a collaboration cap between the Hokkaido Nippon-Ham Fighters and au. I remember receiving it at an au shop, so it's likely not for sale. It has been stored at home for a long time in its original plastic, so it may have lost its shape. I think it's a rare item. The size is unknown because it's in plastic, but please refer to the images from the 6th one onwards. #Hokkaido #NipponHam #Fighters #au #KDDI #BaseballCap #Hat