Gas refill for Horse Pilot Airbag Vest. The airbag refill developed by In&Motion has been designed to guarantee an ergonomic shape and a large volume of gas for optimal protection. Thanks to an air volume trapped in 4 small cartridges, the system keeps a discreet and comfortable shape. When triggered, the 4 small gas cylinders contained in the cartridge instantly empty to inflate the entire airbag. Horse Pilots gas refills are compatible for all of our airbag models: the V.1 riding airbag vest and the new Twist'air riding airbag vest. for women or men. ** The import of gas cartridges into Mexico is highly regulated and an import license is required. Please contact your country delegation for details. **