Maryland Terrapins Full Size Speed Replica NCAA Helmet by Riddell. This full size Maryland Terrapins 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 NCAA helmet is great for autographs and features Maryland Terrapins team logo decals on both sides. The striking shape of the future. NCAA Maryland Terrapins Replica Speed helmet size medium measures: 12.75"(L), 9.25"(W), 9.75"(H). NCAA Maryland Terrapins Full Size Speed Replica Helmet. (NOT FOR WEARING)