ill start from price point to kaos to pro
Ok so the first boot, the spk kreation boot....blue in color, does not have the lacing, has a smaller strap, no calve muscle pad, 85 flex rating...softest out of the 3
Spk kaos boot, same as last years spk boot, has the thicker strap, lacing, calve muscle pad, heat moldable liner, but not fully heat moldable..95 flex rating.....
spk pro..the only difference between this boot and the kaos is the leather...but i have heard 2 things...the kaos and the pro have differnet liners, the pro has a fully moldable liner, where the kaos does not......my salo rep tells me otherwise, and the only difference is the leather...hope this helps u