Using these belts is easy. Just insert the belt through the belt loops of your pants and buckle it up. When choosing the right fit, you can adjust it according to your waist size. As for maintenance, keep the belts away from sharp objects to avoid scratches. Also, don't expose them to extreme heat or moisture, as this can damage the polyurethane material. Be aware of the California Proposition 65 warning. If you have any concerns about the chemicals in the product, visit the provided website for more details.