The term MEDIEVAL HELMET can be broken down into two crossword solutions: ARMET (5 letters) and SALLET (6 letters). An ARMET is a type of helmet that was popular during the 15th and 16th centuries. It was characterized by its rounded shape and a visor that protected the face. A SALLET is a type of helmet that was popular during the late Middle Ages and Renaissance. It was characterized by its pointed shape and a visor that protected the face. Both helmets were used to protect the head in battle and were made of metal.