All of the Strolz Ski Boots do have adjustments that can be made for stiffness (forward flex). They also offer two different densities of shells (black or red), the black shell I have found works for 98% of skiers.
Generally I make liner and shell modifications 70-80% of the time. The liners are custom injected foam, not heat molded or themoflex
Sized available are from 2 - 16 US.www.strolzboots.com