Japanese armor consists of yoroi for the body and a helmet known as a gabuto for the head. The o-yoroi (great armor) that was used by elite samurai from the Heian (794–1185) to the Kamakura periods (1185–1333) was designed for use by mounted archers. From the Nanboku-chō period, close infantry combat became prevalent and warriors’ armor gradually shifted to domaru or haramaki, which was lighter and easier to wear. With the advancement of weaponry and techniques for large-scale battles, tosei-gusoku, an improved version of domaru, appeared in the late Muromachi period (1333–1573). This is a tosei gusoku armor made by using a single plate for the body part and various colored threads for the kusazuri, pieces covering the waist and thighs.