Hit-Air "MX-7" model inflatable air vest in Black Size M The"Hit Air"jacket with its instant activation and attractive style is theultimate jacket for motorcyclists! 50 CC CO2 Cartridge Inluded! Activation is simple and automatic. A coiled wire is attached to both the motorcycle and the jacket. Once the rider and the motorcycle are separated, the coiled wire pulls a "key" out of a gas release system and inert gas inflates the air cushion. The inflated jacket provides the necessaryimpact protection. After a few seconds the gas is automatically released through the gas release valve.