My son is supreme sensitive when it comes to underware. On day in cotton tight-whities will leave him with a rash for a week. I've been doing nylon briefs but the seams still rub him sometimes. I gave him a pair of these and, as soon as he put them on, he smiled big and let out a big "Ooooooo!" The only problem is, now he loves them so much, he won't wear any other undies! Guess I'm buying some more.