Iowa Hawkeyes Full Size Authentic SpeedFlex NCAA Helmet by Riddell. The SpeedFlex helmet has quickly become the most popular helmet of choice by top NFL players. This helmet is the most authentically-inspired collectible in our line. Complete with comfort overliner and quick release facemask attachments, the unmistakable look of the SpeedFlex has become the new icon of the game. Comes in official team colors and SF-2B-SW facemask