Using these New Balance insoles is easy. Just take out the existing insoles from your shoes and place these new ones inside. Make sure they fit properly and are aligned. As for precautions, avoid using them in extremely high - temperature environments as it might affect the performance of the foam. For maintenance, you can gently wash them with mild soap and water when they get dirty. Let them air - dry completely before putting them back in your shoes. This way, you can keep enjoying the comfort and support these insoles provide for a long time.