This was really something we were careful not to botch - the Mimic material in the ankle/heel area replaced the older "3D" material 1:1 - same thickness, same hardness, same shape. The out-of-the-box fit between a Mimic Platinum liner and a 3D Platinum liner is identical, so this tells me you would have the same pressure points in the older liner too. The big benefit here is that the Mimic material will reshape to whatever is next to it, whereas the 3D material doesn't change shape after it is first molded into shape.