Although it is rare, it sometimes happens that the life jacket supports enough weight for a given child, but that the life jacket is physically too small.
If this cannot be done, the life jacket is an improper fit.
Air only - term used to describe a life jacket that only becomes buoyant upon filling with gas.
You'll be wearing a parachute, just like you would wear a life jacket whilst sailing.
When a child wears a Sea Squirts life jacket they wear it not because they can't swim or they have to because their parents say so.