These are appropriate for giving life to older shoes. Just toss out the old inserts and replace them. They aren't overly soft, so I don't know about the "memory foam" part, which makes me think of soft and squishy. Think of these more as shock absorption. Some of my husband's work boots have virtually no insole. This provides extra cushion as long as there is room in the boots to add insoles (I like to buy my boots a size up and add insoles). For tennis shoe styles, the old insoles need to be removed first.
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