Northwestern Wildcats Authentic Speed Football Helmet. Perfect item for autographs and collectors. This full size Northwestern 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. NCAA Team name on back bumper. The officially licensed Northwestern Wildcats helmet is great for autographs and features Wildcats team logo decals on both sides. The striking shape of the future. NCAA Wildcats Authentic Revolution Speed helmet size is 13.5"(L) x 9.75"(W) x 10.25"(H). NCAA NNorthwestern Wildcats Full Size Helmet.