Using these New Balance 840v5 running shoes is easy. Just lace them up using the adjustable lace closure to get a fit that's right for you. You can wear them for your daily runs, whether it's on the track, road, or trail. When it comes to maintenance, it's a good idea to clean them regularly. You can use a soft brush and mild soap to gently clean the upper part of the shoes. Avoid using harsh chemicals as they might damage the mesh and synthetic materials. After cleaning, let them air - dry. Also, make sure to store them in a cool, dry place. Be aware that the 12 mm drop is an approximate value due to manufacturing differences, so don't worry too much if there's a slight variation. These shoes are designed to be durable, but if you notice any significant wear and tear, it might be time to replace them.