Abstract: A flag device constructed of a foam or foam-like plastic material of sufficient thickness and strength to be able to stand out in a substantially horizontal condition when supported along one side edge without collapsing. The invention also resides in a novel support structure for the subject flag including an elongated member to which the flag is attached. The support structure may include a novel buoyant structure with a rod extending therethrough, one end of the rod having a weight attached thereto and the opposite end adapted for attaching a flag thereto.