Using these Superfeet All - Purpose Low Arch Support Insoles is easy. First, take out the existing insole from your shoe if it's removable. Then, place the new insole in your shoe and make sure it fits well. If it's a bit too big, you can trim it according to your shoe size. When it comes to maintenance, keep your insoles clean by wiping them with a damp cloth regularly. Avoid exposing them to extreme heat or direct sunlight, as this may damage the foam. Also, if you notice that the support isn't as good as before or they've been used for 12 months or 500 miles (whichever comes first), it's time to replace them. These insoles are suitable for slim - fitting shoes, so make sure your footwear is a good match.