Pewter Medieval Knight Helmet by Nicky Bigs Novelties Thick Plastic Medieval Knight Helmet with Folding Face Mask Front. Adhesive foam strips or gluing foam strips on the inside can help for comfort and adjusting the size to fit smaller heads. Outside Measurements are Approximately 9 W 9 H 10 D. The great helm or heaume also called pot helm bucket helm and barrel helm is a helmet of the High Middle Ages which arose in the late twelfth century in the context of the Crusades and remained in use until the fourteenth century. They were used by knights and heavy infantry in most European armies between about 1220 to 1540 AD.In its simplest form the great helm was a flat-topped cylinder of steel that completely covered the head and had only very small openings for the eyes and mouth. Later designs gained more of a curved design particularly on the top to deflect or lessen the impact of blows. Helmets may have slight scratches and paint splotches due handling and hand painting. For Ages 14 and Older. Chose