JB justified the price hike for the XVII likely due to the additional metal briefcase. I don't think the price hike would be a result of the technology involved with the shoe's outsole, insole, midsole, cushioning system, etc. I don't think it'd have anything to do with the inner booty either. If anything, the price hike must most likely be from that special Swiss fabric the shoe's upper is made out of. We've yet to see what really makes that material special, if anything. For all we know, it could just be overly glorified fabric with little to no added performance and durability aspects (like Foamposite, etc.)