We can offer some tips for mainting the shoes:
In the event, the soles become very worn down, we recommend replacing them with an additional leather sole as soon as possible.
It is not recommended to walk on wet grass as shoes will get dirty and the stains are very difficult to remove. Affixing a new leather sole is also recommended as this will protect them from the heat and rain and they will last longer.
Please note that small stains on the leather sole can be softened by rubbing gently with a white eraser.