We had a hen who did this also. From the time the kittens were born, she would sit on them and keep them warm while the mother was out hunting, and then they'd trade places while the hen ate so the cat could feed her kittens.
That's about all that these are good for lol. Ugliest shoe ever made IMHO. They showed up in the gardening world many years ago. strictly a gardening shoe. Now these ugly clogs are made for men, women and children. The men's are the worst and I cringe