For those familiar with Arai's helmet line, the Ram-X is basically its top-of-the-line Corsair-X without the chin bar. Venting is the same, which is among the best of any helmet we've ever tested. The small stabilizing wing on the back of the helmet has been modified to work better with the open-face design, improving stability and reducing fatigue. Our size large helmet weighed in at 4 pounds, though, which puts it among the heavier helmets we've tested. Luckily, because of the dialed-in aerodynamics, the weight is carried well and not too intrusive or fatiguing.