My son wears 2T-3T and I ordered 3T. Although the label says "M". It's quite long but thin. This will help him stay in place, but if you have a stronger child, he may grow small. I like how thick the material feels. It's hard to believe that the fabric my fingers are showing through is actually protecting my son from the sun. Don't worry here. Even when stretched, it remains opaque. We spend almost every day in the pool during the summer, and the Southern California sun is no joke. I always hang swimsuits on delicates in the cold after washing. everything is good here so far. If he doesn't make it to the end of the season - and many won't - I'll definitely update my review to reflect him! But it seems to be holding up.
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