Obvious answer (0.5) out of the way first, to save anyone bothering...:)
I'm looking at getting some new Head Raptor boots. I know that the shells themselves only move up in increments of 1cm, but you can get half sizes (26.0, 26.5), depending on what liner is used. BUT, I've heard that in fact not only is the shell the same, but the liner is too, and the only difference between the half sizes is that the 'smaller' size simply has a thicker footbed to take up volume. Does anyone know the truth of this? Is there really no difference between liners in the half sizes? It's very hard to find an 'official' answer to this.