The armet reached the height of its popularity during the late 15th and early 16th centuries, when western European full plate armour had been perfected. Movable face and cheek pieces allowed the wearer to close the helmet, thus fully protecting the head from blows. The term armet was often applied in contemporary usage to any fully enclosing helmet, however, modern scholarship draws a distinction between the armet and the outwardly similar close helmet (or close helm) on the basis of their construction, especially their means of opening to allow them to be worn. While an armet had two large cheekpieces hinged at the skull and opened laterally, a close helmet instead had a kind of movable bevor which was attached to the same pivot points as its visor and opened vertically.