Got this at 10 for my almost 8 year old who falls pretty much in the 50th percentile on the height and weight charts. Size 10 pants tend to be quite baggy on him, and either good or bad in length/waist (either too big or a little big, but fit well enough to be worn anyway), but they are *almost * too small. They can last all winter as long as he doesn't grow too big or play too roughly during the break. I'm still debating, only coming back because they seem questionable in quality, sizing aside as they tear easily they might not be worth a few bucks I'm saving and I figured a full elastic waistband would be better for him as any zipper/buttons/etc but I'm undecided on that one.
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