THE GIRO AEON THE LEADING COMBINATION OF LIGHT WEIGHT, COMFORT AND COOLING PERFORMANCE. Imagine a helmet that gives you an advantage every time the road climbs or the heat turns up. Until now, you couldnt get the benefits of lighter weight and better ventilation in a single helmet. But the new Aeon weighs only 222g in a CPSC approved size Medium. Yet it also provides cooling power equivalent to the most ventilated helmet ever made, the Ionos. Plus it offers the luxurious feel of Roc LocR 5, and an innovative thermoformed Roll Cage reinforcement. If youre looking for the best balance of weight, ventilation and comfort, this is the new standard.