Kansas City Chiefs Riddell Speed Throwback 63-73 Replica Full Size Football Helmet. This full size Kansas City Chiefs helmet is designed with a non-wear plate and molded foam jaw pads. a steel polyvinyl-coated face mask, 4-pt chin strap, and elliptical air vents. The officially licensed NFL Kansas City Chiefs helmet is great for autographs and features Chiefs team logo decals on both sides. The striking shape of the game! NFL Kansas City Chiefs. Replica Speed helmet size medium measures: 12.75"(L), 9.25"(W), 9.75"(H). NFL Kansas City Chiefs Full Size Speed Replica Helmet. (NOT FOR WEARING)