I am ALWAYS wary of anything automatic they offer....

how would a term like slippers relate to running shoes?

What if you sold windows compatible accounting software... would Google see the word WINDOWS on your site and serve you ad when someone searched for blinds?

Actually I *do* have a pair of Adidas slippers, Dan :)
Or is this called "sandals" in English?

Sort of (or exactly) like these:

ecx.images-amazon.com/images/I ...

Sandals, yes....