Using these insoles is easy. First, take out the existing removable liner from your moderately to roomily fitting shoes. Then, place the Superfeet insoles in the shoes. You may need to trim the insoles to fit your shoe size - just use a pair of scissors for this. When it comes to maintenance, you can remove the insoles from your shoes and gently wipe them with a damp cloth. Let them dry completely before putting them back in your shoes. Also, avoid exposing them to extreme heat or direct sunlight. These insoles are made to last, but if you notice any signs of wear and tear, it might be time to replace them.