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