I used to have dry skin condition during winters. The heels were severely affected by dryness and turned cracked with skin chipping off. Application of Vaseline ointment or Petroleum jelly helped but not fully. Their application on others portions of the body like legs or trunk was not feasible.
On the advice of someone, I began applying pure mustard oil on all portions of the skin affected by dryness.
Mustard oil application has become a habit and skin dryness has never returned.