The IX had a full length Lunarlon insert and was much firmer than the Kobe Viii insert . However it still lacked the bounce and springiness I love that is found in Micro G, Zoom, and Boost. Another great thing about this cushioning set up is that it is only Zoom and Lunarlon, not a bunch of fillers. Look at the pic and you can see Zoom in the heel and the Lunarlon the rest of the way. This helps lead to the smooth transition from heel to toe