Replacing socks once they are worn out or too thin can also help prevent hot areas and blisters throughout the foot. When a shoe is too loose, the heel of the shoe can move up and down as you walk, causing the fabric of the shoe and your sock to rub against the skin of the heel.
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To prevent such rubbing, you can often replace the worn or poorly fitting running shoes with a better fitting pair, or you can add heel pads to your shoes.