Smelly feet are not very complicated. The condition’s root cause is simple: your feet sweat and your shoes create a sauna for microbes. Sweat itself is just salt and water, which isn’t terribly stinky of its own volition. However, once bacteria begins to flourish and produce waste, the stench can become unbearable! - See more at: http://www.sterishoe.com/foot-care-blog/shoe-odor/what-causes-smelly-feet/#sthash.C7XLehmq.dpuf