I got this for my 7 year old son, as he loves these characters and was squeezing into his old undies. I was disappointed when I opened the package that although it said medium on the outside the briefs were actually a size S! ,a 6 like his old tight ones. He was right there and so excited, he wanted to wear one. I let him and so we cannot return them.
The product itself is good quality. The packaging was erroneous, so Walmart is not to blame.