Using these Superfeet insoles is easy. First, take out the existing liner from your shoe. Then, place the Superfeet insole in the shoe. If it's a bit too big, you can trim it to fit your exact shoe size. Remember, these insoles are designed for a wide range of footwear, so they should work well in most shoes you own. As for maintenance, you can clean them with a mild soap and water when they get dirty. Just let them dry completely before putting them back in your shoes. Also, keep in mind that they're built to last up to 12 months or 500 miles. Once you've reached that limit, it might be time to get a new pair for the best support and comfort.