I think the purpose is to inflate and hold your inner organs safe if you land on your back or side. or if your horse fall on you.apparently it can hold up to a tonne of weight off you for ten seconds.
I dont think they'd be allowed to sell them to riders if they exploded on impact lol.
If you really want to help out guys, if you could copy the link to your friends and others, it would really help me .
If i win, it will be put on Horse & country TV.
and you can all say when you see it " hey look, i helped put that there"