I've had two of these for a few weeks as my two daughters have just started gymnastics. I don't know how they hold up to heavy use but for once a week activities and hand washing they seem decent. My daughter who is a size 4 only squeaks in a 4 and my 5/6 only in a 6. I have ordered a size 8 when they grow up which I expect to do soon. I tried 6 on my 4 year old but it was a bit baggy. If in doubt, increase the size.
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