Houston Texans Full Size Authentic Revolution Speed NFL Helmet by Riddell. This full size Texans 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 Houston Texans helmet is great for autographs and features Texans team logo decals on both sides. The striking shape of the future. NFL Texans Authentic Revolution Speed helmet size is 13.5"(L) x 9.75"(W) x 10.25"(H). NFL Houston Texans Full Size Helmet.