Hi @trfb, I've used Vicks VapoRub on my feet but mostly as a moisturizer but not sure if it helps with thick skin on the bottom of the feet. Mayo Clinic has some information you might find helpful here:

"Why is my skin hard on the bottom of my feet?
Corns and calluses are thick, hardened layers of skin that develop when the skin tries to protect itself against friction or pressure. They often form on feet and toes or hands and fingers. If you're healthy, you don't need treatment for corns and calluses unless they cause pain or you don't like how they look."
-- https://www.mayoclinic.org/diseases-conditions/corns-and-calluses/symptoms-causes/syc-20355946

Here is some additional information on the topic:
-- Understanding plantar fasciopathy: Risk factors, diagnosis and management
https://www.mayoclinic.org/medical-professionals/physical-medicine-rehabilitation/news/understanding-plantar-fasciopathy-risk-factors-diagnosis-and-management/mac-20548770