As a Water Safety Instructor, i think that puddle jumpers are so dangerous!! They promote the child to be vertical in the water, which inhibits them from learning proper swim technique. If they fell in the pool without it, they’ll be confused on how to float or save themselves. When using a Back Float/Swim Bubble, it promotes independence and use of both arms and legs while swimming. Kids can practice all of their strokes with this! And as they improve, you can take layers off of the bubble to p