How do you moisturize your feet?

Lately, I haven't been moisturizing my feet while going to the swimming pool, so they have become so dry that my heels are cracking and really hurting. So, I always take the Vaseline that was lying around at home with me and apply it after I get out of the pool. I am posting this question because I don't see any noticeable results yet, though I'm not sure if it's because I haven't been using it for very long or if Vaseline just isn't very effective.