I retired in 2005, even though I was a crane operator and didn't work very hard I had calluses on my heels. For the next 12 years dried skin would peel off of my calluses. Worst part was when in the winter dry air they would crack. Very painful.
I tried some OTC medicines that didn't work. I happened to mention this to my neighbor and he brought me a sample of this cream called No Crack. I used it and in 1 or 2 days it was all healed. I've used it every winter for years.
My heels no longer crack, but once in a while I get a bad crack in my finger tip and use No Crack, which works wonders.
Edit: On my heel I would put it on a large square Band-aid. Also I bought my bottle online, but can't remember where.