Medieval helmets and armor provided protection for knights and soldiers from around the 11th to 16th centuries. The main types of helmets discussed are the great helmet used to protect the head, the bassinet which developed to shield the nose as well, and the armet which enclosed the entire head using hinged cheek plates. A gorget was also mentioned as a steel collar worn around the neck for additional protection. The document recommends visiting a particular website for more information on medieval helmets.