The fizik m6b donna womens shoe the m6b is made from strong but breathable microtex and nylon mesh together with a rubber outsole and carbon reinforced nylon midsole it has a quick easy and flexible boa ip1 closure system with welded microtex straps the m6b is light stiff and tough 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 midsole s