I love Fizik shoes. I have 3 pair of Vento Stabilita, 2 pair of Vento Ferox Carbon, 1 pair Vento Powerstrap Aeroweave, 2 pair of Terra Powerstrap X4, 1 pair of Terra X5, 1 pair of Terra X3 and the new Aeroweave X. ALL of those shoes above are 43 and all fit identically. The Vento Proxy in 43 that I own has a TON of volume in the forefoot and the single Boa simply cannot close that up. Length and width are spot on to all my others. But the volume is simply too much. These were clearly built on a high volume last. Sizing down won't work IMO. I had to add a thick insole to make the shoes fit like all the others. Not ideal, but works ok. These shoes are the only pair of Fiziks I own that doesn't have the little rubber gripper dots in the heel which keeps the heel firmly planted in the shoe. I know that all sounds bad. But, they are built very well, have incredible ventilation, are reasonably light and if volume is what you need then they might very well be the ticket. Just be aware that if you have any of the other pair of Fiziks like I listed above, these will NOT fit the same.
