I was planning on getting vibram five fingers for my boyfriend as a gift since he has been dying to have a pair of vibram shoesfor the past year but I need help with the size. I know they go by exact inch and I want it to be a surprise so I don't want to ask him how big his foot is exactly. He wears a size 11 shoe so does anyone have a suggestion as to whether I should get the 11 inch, 11 1/4th inch or whatever size. I'm trying to do this as soon as possible because his birthday is in two weeks.Thanks in advance!!!