Look for In Mould Construction as this is a separate shell to EPS Liner. These helmets are light than the standard hardshell contruction.
M I P S - Mips® is designed to help reduce rotational motion to the head in oblique impacts. It will reduce the risk of brain injury by allowing the shell to shift/rotate independently to the inside of the helmet.
Look for venting systems in the shell. Control the airflow to move from the front adn the back to help you remain comfortable and reduce fogging in your goggles.
Wavecell - protect in direction and rotational forces, gliches, flexes and crumples