These crocs are being used in a commercial kitchen and I gotta say they are very grippy!! They will not slip, even in straight oil or soap on a tiled floor.  They're very comfortable and will stay on even if you don't use the strap behind your heel.  The ONLY issue is that it is very easy for garbage and debris to get caught up in the soles.  However, as they are crocs, that's nothing a hose won't take care of.