Ski boot half sizes
The thing with half sizes in ski boots is that they don't really exist. What you need to know is that if the boot is labelled as a .5 there is really no difference in the size of the shell or liner. The only thing you will find different is the stock insole will be a bit thinner, giving the illusion of more space. And really, you should be throwing that insole out anyway.
So ski boot half sizes arent a real thing.