My daughter is nearly 7, and while she's a good swimmer, she's a bit of a worrier generally. She wasn't keen on putting her head under the water, but with these fun throwing balls, it was easy to help her overcome her fears. Because their tails want to float, they stick up above the weighted 'heads', so I could start her on the steps of the kids pool where she didn't even need to put her head under initially, and just gradually work my way further down into the pool without letting on what was happening. Within a few minutes she was 'diving' down to get them and shoving her face in the water without even thinking about it. And the next time we went she was keen just to get going at diving for them. So, for not a lot of money or effort, they really did very quickly get her over her fears. They look pretty durable too, as with most Zoggs products. Recommended.