These were a hit with my son. They're VERY soft (both the material and waist band) and true to size even after washing and drying a few times. My son is 8 years old, 68 lbs, and 54" and the size L (8-10) fit him great. To reference, they are a little larger than size 8 character underwear that you could buy in a store.  I have already bought another set in a different color. Very pleased with these, especially because there are no plain white pairs!