Replying to Duke/Baron size help

so i'm in the process of getting a touring setup and i was planning on getting dukes or barons with them so i could shred some deeper resort days with them too, also planning on getting them because a local shop has them for cheap but only in the small size. my boot size is 27.5 and on markers website it says the small size for duke and baron will go from 265-325 mm but i have no clue how mm convert to ski boot sizing

will the small be large enough for my 27.5 boot?