The Bathing Cap Mandatory sign is made for aquatic environments where patrons are required to wear bathing caps. The sign pictures a person wearing the aforementioned bathing cap and goggles with a green border to suggest that wearing a bathing cap is the appropriate behaviour.

This sign is best displayed around pools and other aquatic facilities both before the patron enters the given area and once they are beside the body of water. It serves as a reminder for patrons to have the necessary equipment before entering the pool or aquatic environment.