We ordered size M for my son who is 4ft 2" and weighs 59lbs and he was comfortable with little room to grow. The material is very soft but my son also found it breathable. He was endlessly amused by the heel, but I guess that's to be expected for a 9-year-old. It washes well and does not shrink and serves as both a good lightweight pajama or a good base layer under winter clothing.
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