Crush your friends on the next group ride, and look so good while doing it. According to Lazer's testing, the Airslide system makes it the best ventilated aero helmet. While we can't confirm that with numbers, it is very easy to open and close the vents. It's not the lightest helmet we have tried on, but it's well balanced on the head and doesn't seem to have a heavy feeling. Similar in fit to a Giro Synthe, or the Lazer O2 or Z1.