Maryland Terrapins Authentic Speed Football Helmet. Perfect item for autographs and collectors. This full size Maryland Terrapins helmet is designed with extended mandible (jaw area) protection, a steel polyvinyl-coated face mask, chin strap, increased padding, an integrated facemask attachment system and elliptical air vents. NCAA Team name on back bumper. The officially licensed Maryland Terrapins helmet is great for autographs and features Maryland Terrapins team logo decals on both sides. The striking shape of the future. NCAA Maryland Terrapins Authentic Revolution Speed helmet size is 13.5"(L) x 9.75"(W) x 10.25"(H). NCAA Maryland Terrapins Full Size Helmet.