What finally worked for me was locking in moisture within 60 seconds after...

https://bizzmarkblog.com/should-i-put-sunscreen-on-the-backs-of-my-hands-every-day/

What finally worked for me was locking in moisture within 60 seconds after stepping out of the shower. I now use a body lotion with urea around 15% on my heels to soften rough patches. I also make sure to apply SPF on my hands and chest daily