These were one of my Bobmas pressies, and boy they're amazing! :D Their main idea is to keep the belly warm, which they do really well.
The other idea is that they're also the cutest things ever, and they do that really well too.
Here's just to show how them in action. The top covers the belly quite well. As someone who gets some pretty awful cramps once a month, these shorts-things are the best thing ever!