I wear size 12 street shoes. Old ski boots are Lange F7 size 11 with custom footbeds. Fit was a bit snug, especially in the the heels & toes (a little short). My toes would be curled for the first 30 minutes until liner expanded. Tight heel fit required wearing the thinnest socks. Picked up a pair of 2009 Fluid 90 mondo size 29.5 (us 11.5) and whoa. New boot liner is way larger. I now have so much room in the liner that I can stick my entire hand behind my heel. I estimate that the line is probably 1/2 inch longer. I understand the 3DL liner is heat moldable, but a 1/2 inch difference. Am I mistaken, or will I need to down size and how much?

Tech Specs:

Shell Material:

ET material 

Liner Material:

Custom Flo liner 

Thermo-moldable Liner:

Yes 

Number of Buckles:

4 

Micro Adjustable:

Yes 

Forefoot Width:

100mm 

Recommended Use:

Expert all-mountain skiing 

Manufacturer Warranty:

1 Year 

Country of Origin:

Italy