I'm about to make a trade for Full Tilt Seth Pro shells in a 27.5, and I would need to get a liner. I'm looking at Intuition Liners (which is what I'll be buying) and I want to get the PowerWrap liner. If I were to get that for my 27.5 boots, what size should I get, US Mens 9 or 10? 27.5 boots translate to a 9.5 shoe.