My 9 year old wears a medium (size 8-10) at the waist but is slimmer. They fit well and are not tight at all. I gave them a bad rating because 1 out of 4 underwear started to loosen the thread after the first wash and pulling on the thread basically unraveled the seam in the underwear as shown in my picture. I ended up throwing this pair away. Without the protector I would have given 5 stars. Feels like a polyester fabric which my sons love. He says they are comfortable and the belt doesn't bother him. If you find my review helpful, please click the Helpful button. Thanks!
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