They are technically a 28.5 by their standards, but are a 318 BSL, which is a 27/27.5 shell. And they have the intuition liner in them, so that would help with this half sizing issue that you are running in to.
I have 27.5 technica agent 110 flex, ill sell them for 240 shipped, used half a season, i loved them, they ski well, but im a mogul skier, and they are to flexible for the stuff im into
touche. i was talking bout the boot in general it dont matter. but size i wanna try and stick to 27s. BUT let me go try on some 26.5s and i will let you know. this is a killer deal and if 26.5 feel good. i'll purchase from you.