Oklahoma Sooners Authentic Speed Football Helmet. Perfect item for autographs and collectors. This full size Oklahoma 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. The officially licensed Oklahoma Sooners helmet is great for autographs and features Sooners team logo decals on both sides. The striking shape of the future. NCAA Sooners Authentic Revolution Speed helmet size is 13.5"(L) x 9.75"(W) x 10.25"(H). NCAA Oklahoma Sooners Full Size Helmet.