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