Kansas City Chiefs Riddell Speed ECLIPSE Replica Full Size NFL Helmet. This full size Kansas City 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. This officially licensed NFL helmet is great for autographs and features red Kansas City Chiefs team logo decals on the matte black helmet with a black facemask. NFL Kansas City Chiefs Riddell Speed Replica Full Size Football helmet size medium measures: 12.75"(L), 9.25"(W), 9.75"(H) (NOT FOR WEARING)