The fizik m5b mtb shoe the m5b is firsquozikrsquos most accessible mtb shoe inheriting many of its features from the m1 and m3b models its uses are many mtbing cx or even commuting to work this is a comfortable and durable ldquodo anythingrdquo shoe thatrsquos lightweight with a carbon reinforced nylon outsole stiff enough for most many agree that itrsquos hard to find an italian made road cycling shoe that looks as sharp at this price after dedicated