To use these ballet flats, simply slip your feet in and you're ready to go. They're great for casual outings or semi - formal events. When it comes to sizing, just choose your regular shoe size as they fit true to size. For maintenance, use a soft cloth to gently wipe the patent leather clean. Avoid getting them wet in heavy rain or soaking them in water as it might damage the finish. Store them in a cool, dry place when not in use to keep them in good condition.