"Self inflating" means that the mattress will expand (and draw in air) without a pump or use of your lungs. Lie on it with a puncture, however, and it will sti

"Self inflating" means that the mattress will expand (and draw in air) without a pump or use of your lungs. Lie on it with a puncture, however, and it will still go flat. Containing the air is still required to provide support.