Have you compared the soles of your 5ZP Armys to the 379X last? The soles of the 5ZP look nothing like a Truebalance, and the instep seems tighter. Therefore, it seems to correspond to what I would expect of the 379X. I emailed Mack about it, and he said it definitely says Truebalance on his order, and that the orthotic heel changes the look. But I thought the same last should have the same sole.
BoydsShoes
BoydsShoes
