Why an air cushion in your motocross chest protector?

"In Motocross Action magazine‘s opinion, this is the most protective chest protector made. Unlike a hard-shell protector, which only offers a few millimeters of foam padding between a rock and a soft place, the RXR has a cushion of air. A concerned wife, mother, girlfriend, granny or father could rest easy if their loved one wore an RXR. There is no doubt that the airbags absorb more impact than plastic. As an added plus, when the trapped air is compressed, it ramps up its resistance, which makes the RXR active, as opposed to passive protection. When it comes to hitting the ground, nothing absorbs energy better than an airbag (300 million cars can’t be wrong)."