And beyond that how can the brain differentiate the data you ' ll fall in and etc . <| sep |> Really ? I find that hard to believe no offense although I usually tip excessively high rounding like I ' d round that to $ 20 cuz I ' m an idiot . This is why I ' m poor too <| sep |> Happy Birthday ! <| sep |> Basically in the UB it ' s because they fit so tight , like a compression sock , so the length of the shoe doesn ' t matter so much , especially if not running in them . I find the opening on the v 1 to be quite tight so 11 . 5 gives me a bit more room , but length wise the half inch is negligible . For Primeknit NMDs it ' s hard to find a perfect fit as it ' s a more loose and floppy in 10 s my foot sits a little more forward and overall it seems to fit better , but the ridges of my toes and feet show through the PK sometimes and I personally don ' t like that . With 10 . 5 this is less of an issue but overall it fits looser , so I use an aftermarket insole which greatly improves comfort in the insoleless NMDs anyway . Hope that helps .