Infinite shoe durability does what it says on the shoebox - disabling the wear and tear Henry accumulates on his footwear while gallivanting around the Bohemian wilderness, and so eliminating the need to replace or repair his favourite pair. To me, this is both a little baffling (again, surely you play a game like KC:D II for this kind of frictive minutiae), but also very funny, simply because I find the idea of infinite shoes very funny.