my buddy FRED from RW1905 blog send me some pics of an actual cut RWS style #8131 – the cut of the 875 seems to be a bit older – sorry for that! he told me that the actual models are filled with CORK between insole and the traction tred cushion crepe wedge sole. before, this space was filled with synthetic material: compare the pics. thx. pics | FRED c/o RW1905