I meant edge protection, not edge resistance. Basically it is meant to offer a buffer level before the damage type modifiers kick in ( the 1.5x for cutting, 2x for impaling) etc. It represents, not only the increased resistance of certain types of metal armor to cutting, but can also be applied to certain types of type weave cloth to arrows.
Edge protection has been discussed in various places on the web, but at the moment, I can't recall what might be considered "the best".
Does edge protection ring a bell with you at all?