Rics

These are not Crocs, they are 'Rics'.
They are around $3.49 in the Dollar (and up) store. (Err on the side of 'up').
…And, my Personal favorite, the Tactical ‘Mississippi Mocs’.
The agile contour allows for quick in-and-out access *(twss) but still provides a snug grip. Excellent placed tread on the bottoms ensures confident grip up enemy terrain or carpetted hall steps. You could easily wear these to work with a black sock and go by undetected.
+1 for Ninjas & Navy Seals.
*that's what she said.

