Bought these as cheap tight shorts for my boys to wear to kids triathlon not as a big trunks. I bought medium for my 4 year old and large for my 7 year old. Both fit well - the medium was a little loose on my 4 year old but didn't fall off when tied. The big one was tighter on my 7 year old but not too much. Fits well. We're still using them a year later and they're in great condition! My youngest son likes them better than swimming trunks!
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