It gives the boot more flexibility, which is supposed to result in better agility, and east west movements. I mean, it could be legit if done right. If the boot flexes more, and moves with you, then this would result in better agility
Anybody have a chance to try these out yet? tried them on today, fit great, but not sure about the tpu outsole. Not saying its bad, just don't know. Have been using full composite boots for 10+ years now