Dallas Cowboys Full Size Authentic Speed Throwback NFL Helmet by Riddell. This full size 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. NFL Team name on back bumper (except Chiefs, Steelers and Giants). The officially licensed Dallas Cowboys helmet is great for autographs and features Cowboys team logo decals on both sides. The striking shape of the future. NFL Cowboys Authentic Revolution Speed helmet size is 13.5"(L) x 9.75"(W) x 10.25"(H). NFL Dallas Cowboys Full Size Helmet.