I'm not sure if I'm posting this in the right place. Or whether I should be posting it at all, its probably not the kind of information people want to know. Although you can probably smell them from wherever you are anyway.
Anyway, I just wondered if anyone has any ideas/products which will help sort the problem. Whatever shoes I wear always end up smelly. My favourite comfortable sandals are the worst - I can smell them now. With closed in shoes I've put odour-eating insoles inside, but that wouldn't work for open toe shoes as you'd be able to see the insole. I've also tried putting talcum powder on my feet and in the shoes, which works temporarily (although does make me emit a cloud of smoke from my feet when I start walking) but by half way through the day it has worn off and I can smell my own feet again.
Feeling embarrassed by it now - the shoes I'm wearing now are only a month or two old but they just reek. 
Any ideas???