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The soles of your feet are soft and after being exposed to water, become quite susceptible to cuts and scrapes. If you are going to be underwater for any substantial length of time, wear some protective swimwear on your feet. Swim fins should always have neoprene swim socks underneath. Otherwise, the fins will rub the ankles and heels raw. It is a good idea to wear swim socks or swim shoes in the water even if you aren't wearing fins. This is especially true if you are going to be at the ocean or a lake. There are many things in natural bodies of water that can cut your feet, including shells and glass.