Ah!
Mine are also glued along the whole length, but I never really unhook them either, because of the "thick" plastic on my 2mm and my small hooks, they don't unhook easily, so I leave them alone and just slide my foot through. The flex enough to let my heel pass through without any real issues. I wish I could close them a little bit tighter though. Or I could use a wider cover strip in the back. mine is only 20 mm, but I'm out of plastic.