Using these insoles is easy. Just take out the existing insoles from your shoes and place these new ones in. They're designed to fit most men's shoes. When it comes to maintenance, you can gently wipe them with a damp cloth to keep them clean. Avoid soaking them in water as it may damage the memory foam. Also, make sure to choose the right size according to the size guide. If you feel any discomfort, double - check if the size is correct. With proper care, these insoles will last you a long time and keep your feet comfortable.