Does not hold air :(

I bought this for my 6 year old to practice his kicks for Taekwondo. He doesn't hit or kick very hard so I figured it would be a good option. We followed the inflation directions and by the next morning it was completely flat. Will not hold air for a long period of time. I am guessing there is a slow leak in it that I can't find. We have to re-inflate it right before my son wants to use it. I wouldn't purchase again or recommend it only because it doesn't hold its shape.

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