Ovation Vantage ERT (Energy Reduction Technology) Helmet The Ovation Vantage ERT is a high perfomance helmet with ring-ready style. Includes Energy Reduction Technology to help reduce rotational force to your head in certain types of impact. Features: ERT (Energy Reduction Technology) foam that reduce the effects of both rotational and linear impacts Up to 18-21% performance improvement in mitigating rotational impact and 3-5% improvement during linear impacts 8 front top and rear vents for maximum ventilation Hybrid tech shell and EPS liner for optimal impact resistance Harness strap system for great fit and stability Heat sealed pad which wick away sweat and increase comfort