I mainly used other pajamas, so I've only worn these a few times, but the pants have some slight pilling. They're fleece-lined and have a built-in belly band, so your stomach stays warm and you can feel secure ☺︎ ※These are used items and have been inspected by a non-professional, so there may be other overlooked flaws ( ; ; ). Please purchase only if you understand this. I will fold them compactly for shipping, so please refrain from purchasing if you are sensitive to this. Type: Belly band