Bought these for 2 pairs of beloved and well worn sneakers.
I switch on and off between the 2 pairs, and wear them everywhere.

The balls are strong smelling stuff. That'd be okay if had some kind of odor fighting abilities.
The balls actually tries to mask the bad odor.

Instead of the usual funky smell that is associated with sweat and overuse of the sneakers.
The shoes now have these professional grade bathroom cleaner stench + usual funky smell = whole new level of bad.