I bought model M (size 8-10) for my tall and thin 7 year old. It's skin-tight, which is good, but the openings in the sleeves are so tight they almost cut off blood flow at the wrists. It dissolved a bit in the water when he started swimming, but I agree with everyone who said this shirt runs small. tried it in the pool last night). The material is thick and well made, reminding me of the Gymboree rash guards we loved when they were available.
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