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