The following is the first version of the prototype.

whole assembly with my feet

Module Integration with the shoe

The cooler module with insole

Next time:

1. The whole setup was quite bulky, I would try to minimize the size or redistribute everything and make them look nicer.
2. The shoe mount is not entirely firm
3. The workmanship of the tube bending and the water inlet outlet has to be improved.
4. The insole and cooling tank can not be detached easily, which may hinder the maintenance job or fill up the water tank.
5. No idea about the water level