I was expecting more from the t-shirt material, but these are thicker and more form-fitting. They are actually better quality than I thought. I will say however that my 9 year old son is very slim and very small for his age and they fit his arms and torso but even his body. Luckily they have a good stretch. I can't imagine a size 9-10 would fit a larger 9 year old so maybe that's a good idea.
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