Just received (white). The shirt is soft and of good quality, not see through at all. It fits loose like a regular t shirt and works as my son is not a fan of high collar rashguards. However, it was much more than I expected. My 11 year old usually wears a size 10/12 and the size chart says "fits true" so I bought L (12). I measured it on a plus size UA t-shirt and it's identical so I recommend sizing down if your child is a size 10/12. I think the length would be ok, but it's too wide/tall for this purpose. I just ordered it in M (10) so I'm sure it will fit perfectly. :)
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