Helmet Comparison (image) Virginia Tech Caption The ability of the Riddell Revolution (left) and the Riddell VSR4 (right) helmets to reduce concussion risk was compared in the study. A significant difference in concussion risk between these two helmet designs was found by the authors. Credit Virginia Tech Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.