These shoes replaced my original F-Lite 230. They are heavier and more durable. I only use them in the gym. But the F 230 was the most comfortable running shoe ever! .NOTE. I always recommend ordering the European size rather than relying on the US size. That has proved to be the case with this shoe. 45EU can be 10.5 to 11.5 US male. That's why I always order EU45 and it fits.