I take size 48 and use size 48 and wear with sealskins and merino inner sock in winter and fit although a bit tight is fine, shoe i have has srs and although sole is coming awa in parts it is stilol stuck on and if i wasnt so tight i would have replaced it sooner, this is after 3 years use btw, i have onlt used high end race shoe by spec and sidi for mtb and sidi are better by far imo