To use these shorts, simply put them on like you would any regular pair of shorts before your cycling session. When it comes to sizing, make sure to refer to Castelli's size chart for the best fit. For maintenance, it's recommended to wash them in cold water and hang them to dry. Avoid using harsh detergents or fabric softeners as they can damage the fabric and the seat pad. Also, don't iron the shorts directly as it may affect the performance of the special features. If you notice any loose threads or small damages, it's best to repair them promptly to ensure the longevity of the shorts.