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Make a long term moisturizing routine. Find a lanolin cream. Look for the right ingredients in other moisturizers. Apply a light layer directly after bathing or soaking. Apply a thick layer of moisturizer at night.
Once you've started to heal the cracks in your skin, your best bet is to start a long term routine to prevent more cracks. Unfortunately, this is a skin problem that is better to focus on preventing then on fixing once it occurs. Whatever moisturizing routine you use, just make sure that it's something you can keep up long-term and use regularly, since this is the best way to prevent future issues. Lanolin, which is a wax-like substance made from wool-producing animals, is nature's best way of protecting skin. Used consistently, you should be able to apply it every other day or every third day and still see the same soft skin. When you first start using it, apply it liberally at night and give it time to soak into your skin. Bag Balm is the most common brand of lanolin product in the US and can be found at most drug stores. If not using lanolin, you'll want to analyze what moisturizing products you do buy. You'll want products with the right kinds of ingredients, to guarantee that you get the right effect. Many moisturizers will include lots of natural, healthy sounding ingredients but they won't actually help your skin very much. You'll want to instead look for these in the ingredients list:  Humectants, which draw moisture into your skin. Examples include glycerin and lactic acid. Emollients, which protect your skin. Examples include lanolin, urea, and silicon oils. Every time you bath or expose your cracked skin to water, you're washing away natural oils which protect your skin. Apply at least a light level of moisturizer after every shower, as well as any time you soak your feet. If you can, apply a thick layer of moisturizer before going to bed at night. This will give your feet time to really soak all of that healing product in, while making sure that you're not bothered by squishy skin. Cover your skin thickly in moisturizer and then put on a layer to protect the moisturizer while it soaks in. If the cracks are on your feet, use socks. If the cracks are on your hands, use gloves.