Our 3+ year old son began to complain that his briefs didn't fit comfortably.  I wasn't even sure boxer briefs were made for preschoolers, so I was thrilled to find these.  It's a plus that they are Spider Man, because I think he would have been sad to go to plain undies after having super heroes briefs for so long.  All said, he said they were more comfortable immediately, so he now wears only these.  I'm glad we found them, and will continue getting boxer briefs for him.