The updated Saucony Omni dispenses with the former ISOFIT Upper in favor of FORMFIT for a better feel. A TPU frame results in a very stable shoe and the lack of a hard posting means that the stability provided by the Omni 19 will never be too aggressive. This looks like a very comfortable update. The new PWRRUN midsole is a fantastic balance between softness and responsiveness and results in excellent energy return.