You can kind of see a tuck on the side. My guess is that they still have some sort of structure like a foam piece under the top/front and then it’s pinned in such a way underneath to prevent it from showing, but not in such a way that would prevent the hair on top from free falling. I’m far from an expert though; my only experience is from having my own hair done for weddings and they added foam or mesh pieces in there to fake the shape they wanted.