I followed the size chart on the site. 11-12 years old need size XXL. The boy will be 12 years old in 2 months, tall but average weight. But the shirt is WAY big. So maybe I'll let him until he gets older. The fabric is thin - not as comfortable a weight as I thought it would be for a waffle shirt. Overall, I don't recommend this shirt, but I may not return it. UPDATE: I RETURNED this item - the fabric is too thin so not worth storing. But Revain simplifies the return process, so that's not a problem. So I'm leaving it at 2 stars instead of downgrading to 1.
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