Miami Dolphins Full Size Speed Replica NFL Helmet by Riddell. This full size Dolphins 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. NFL Team name on back bumper (except Chiefs, Steelers and Giants). The officially licensed NFL helmet is great for autographs and features Dolphins team logo decals on both sides. The striking shape of the future. NFL Dolphins Replica Speed helmet size medium measures: 12.75'(L), 9.25'(W), 9.75'(H). NFL Miami Dolphins Full Size Speed Replica Helmet. (NOT FOR WEARING)