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Can't see the picture, but, if you look on the heel of the boot there is a BSL number. 301 is size 26/26.5, 310 is 27/27.5. The shell length is the same for the half sizes (so the shell of a 27 is the same as a 27.5), the only difference is the liner size, so take out the liner and look at the back, there is a M S x.x (where the x's are numbers, if it's a .5 then you know it's a half size, if it's a .0 or it doesn't have a number it's a full size).