Rome, do you have sizing suggestions for a pair of 9 Kaijus?
Since you're in the middle of the size range it'll be up to you based on a couple things.
Do you want to have a bit of a smaller footprint, save a little weight, and max out your size settings? Go with a S/M.
Do you want a bit of a taller highback, a little extra room in case your boots are a bit wider or bulkier than normal, and minimize your size settings? Go with the L/XL.