Northwave extreme rr road shoesthese extreme rr road shoes from northwave have ultralight carbon 15 soles made of 100 unidirectional carbon with a stiffness index of 150 making these northwaves best performing soles ever they are nw speedplay adapter compatible providing the lowest stack height between feet and pedals these shoes are made from northwaves xframe patented construction and ultralight next generation materials that are only 05mm thick so the uppers transfer every watt of powe