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