Minecraft wiki entry for Helmet, associated text: With the exception of netherite, to craft a helmet, five pieces of the helmet's material must be arranged in the form of a helmet on the crafting grid. A damaged helmet is repaired by placing two damaged helmets of the same material in the crafting table grid or inventory grid. The durability of each is combined, plus an extra 5% durability, but not exceeding the maximum durability allowed for that item.