I have it. Shoes already a few weeks in use For me to work it teems with an oil / salt mixture that have already sent some shoes from me to Nirvana. Within 3 weeks These keep it out easily.
Disadvantage: The soles squeak that it is no longer solemnly. I can not take a step without going to be heard from yards away. In addition, I doubt the breathability. I've never had trouble with sweaty feet, already ....
