Using these Superfeet insoles is easy. Just take out the removable liner from your roomy to moderately-fitting shoes and put the Superfeet insoles in their place. You can trim them to fit your shoe size. When it comes to maintenance, keep them clean by wiping them with a damp cloth if they get dirty. Avoid using harsh chemicals as they might damage the insoles. These insoles are designed to last up to 12 months or 500 miles, so once you reach either of these limits, it's a good idea to replace them for continued support and comfort. Also, if you have any specific foot conditions, it's always a good idea to consult a doctor before using these insoles.