As your feet have to move about a lot more, somehow the calluses just go away. I don't have cracked skin any more in the winter. I always had really deep cracks in the heel and my entire foot, really. I don't have that at all any more. I do still have to rub cream in, as they are still quite dry, but it's not as bad as how it used to be.
At first I would have laughed at anyone who'd told me how great the kyBoot is. After wearing the kyBoot myself and discovering how much good they do me, I believe what the adverts say.