Using these Superfeet insoles is easy. First, take out the existing liner from your roomy to moderately - fitting dress, work, or casual shoes. Then, place the Superfeet insole in the shoe. If it's a bit too big, just trim it to fit your shoe size. As for maintenance, you can gently wipe them with a damp cloth when they get dirty. Make sure to let them dry completely before putting them back in your shoes. Keep in mind that these insoles are for unisex use, so they're suitable for both men and women. Also, avoid exposing them to extreme heat or direct sunlight for a long time as it may damage the memory foam and carbon - fiber arch support.