To use these belts, simply wrap them around your waist and fasten the metal buckle. These belts are elastic, so they should fit comfortably. Be aware that they contain chemicals like cadmium, lead, and nickel, which can be harmful. Avoid contact with skin for long periods if you're sensitive. To maintain these belts, keep them dry and away from sharp objects to prevent damage to the elastic and buckle. If they get dirty, you can gently wipe them with a soft, dry cloth.