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Oodles of Bag Balm, especially when you go to bed (use DH's gym socks to keep from messing up the sheets) wear closed heeled shoes with cotton socks until the cracks heal, and remember to use sun block when you're going sockless: the cracks are mostly from sunburn.
If you don't have BB inthe house, petroleum jelly is OK but doesn't work as well. Vitamen E Oil is really good, especially if you soak your feet and rub it in, but it doesn't stay on your skin as well as more solid oils.
The best of the best is actually lard, if you've got it, or even unsalted butter. Or suet, or bear greese. NOT goose greese or chicken fat, for the same reason E-oil is imperfect.
(Diabetic, has been taught these things the hard way).