It’s a big job to take on a sequel, but Giro knew that the Atmos was getting a little long in the tooth, despite its massive worldwide popularity. So, it took what everyone loved about the original Atmos (the light weight, comfort, and ventilation), and packed it full of new technology. The biggest change is the inclusion of the SL Roll Cage, a thermoformed structure that provides the frame for the EPS foam. The SL Roll Cage prevents the helmet from breaking apart in an impact, so that it can do a better job of protecting your head the way it was designed to do.