Chainmail Aventail Knight Armor Crusader Costume Uncoated Larp Reenactment. An Aventail is a curtain of chainmail, generally fixed to the bottom edge of a helmet, which protects the neck and shoulders. Our large aventail is constructed from butted high tensile steel rings in a traditional “4 in 1” pattern. Finish: Natural Material: 16 gauge High Tensile Steel Ring Type: Butted / Round Diameter: 9mm Weight: 3.348kg Length (top to base): 38cm Coated in oil to protect, lubricant and prevent rust. All dimensions are approximate and may vary from piece to piece.