In reply to BusyLizzie:
> That makes sense. The rash is on the lower part of the sides of my feet - ie not on top of the feet,....
This is also the part that would get the most abrasion and the least breathable part of the shoe thanks to the rubber.
I maintain it's just normal sweat rash.
Have you tried giving the shoes a good scrub clean and then when dry a liberal dosing with talk? (it doesn't have to be antifungal athletes foot powder).