USC Trojans Mid Size SpeedFlex Football Helmet. The ultimate NCAA Mid Size SpeedFlex Football Helmet collectible, perfect NCAA Mid Size Speed Football Helmets for autographs and collectors. Mid Size Speed Football Helmet with great graphics. Official NCAA Mid Size SpeedFlex Football Helmet with official NCAA team decal. Iconic SpeedFlex shell with a plastic SF-2BD-SW face mask. Internal padding and soft cup chinstrap includes a visor This is an affordable NCAA football helmet for the true fan. Size: between Replica and Mini versions of NCAA football helmets. Size: 10 (L), 6.25 (W), 7.5 (H) - (NOT FOR WEARING).