We washed these prior to use according to manufacturer's instructions and a couple of times since. The fabric has stayed so soft and has had no shrinkage as of yet. My 9 yo son currently weighs 88 pounds. He's 52 inches tall, 28 inches at the waist and 32 inches at the hip. These fit him snug-but-not-tight as short briefs. Some other brands in this size he has are Hanes, the Cat & Jack brand from Target, those fit him snugly in this size range as well but are longer and go down the thighs more. Hope that helps for comparison's sake.