Horse Pilot Airbag Vest Twist Air NavyWhen triggered, the airbag protects the cervical vertebrae, back, hips, spine and neck. 42 gram gas cartridge refill. The ergonomic design and bi stretch fabric allow the airbag to inflate fully while keeping the vest lightweight. Mesh panels on the sides and back provide the breathability needed during intense effort. The cable connecting rider to saddle is magnetic: it connects and disconnects with one hand, so the rider never has to drop the reins.