I have tried one other product prior to this one - which did not totally work for my feet.
This one, however works really well.
As suggested by the others, I soaked my feet for 5-10 minutes (just being in the shower for this long period makes sense for me) and then put my feet into the bags for 60 minutes.
Waited 4-5 days and while I'm showering I noticed that my feet has started to flake, I could feel the little pieces of skin falling off. I left it alone, wore socks most of the time because it feels really gross. After a week, my feet are visibly softer. Just needed to buff a little bit of excess off - but it worked really great!