Do-maru Armor is a unique technology in Age of Empires IV: The Sultans Ascend available to the Japanese and can be researched at the Stable in the Imperial Age. It enables Mounted Samurai and the Uma Bannerman to move 10% faster as long as their Deflective Armor charge is full. Only Mounted Samurai receive a visual upgrade from this technology.
The research speed of this technology is +150% at a Stable with a garrisoned Yorishiro.