I hope that you understand that in your specification of "park boots" the difference in all of the full tilts from "big mountain" to "park" boots is the tongues. The tongues are stiffer in the big mountain boots at a 110 flex and about a 90 flex in the park boots. If you are still looking for boots. I personally own two sets of tongues in different flexes. So in purchasing my boots, you will receive both pairs of tongues and two different sets of cable covers. That way you can put the soft ones in if you wish when you ski park and put the stiffer ones in when you want to charge. I hope that gives you a little bit more clarity on how full tilt's three piece system works