It appears to be a cell phone case originally. How you use it is up to you. It's made of a material similar to a wetsuit. Length: Approximately 13.5cm Width: Approximately 8cm How about putting in cigarettes, tissues, a handkerchief, etc., and attaching it to your waist for walks or marathon training? One is unused, and one has been used once. Please understand that these are items stored at home before purchasing.