For brands like Under Armor and a few other brands, my 10 year old son wears a medium boy size. For this shirt I went by the size chart which said to order X-Large (12) for a 10 year old. I'm glad I went by the size chart and not the size I usually order for it. -fourteen. That's all, check the size chart for all clothing items as it seems to vary from one shirt to the next. The shirt itself makes a pretty good impression. The length of the arm is a bit longer but other than that it fits my 10 year old perfectly. The quality seems good, there are no seams or holes anywhere.
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