What are the main differences between this...
What are the main differences between this boot and the ZZero4 U-TF boot?
The Zzero 4 C-TF is stiffer and lighter(1595 grams vs. 1705 grams/per foot). The shell and cuff are Pebax vs. PU(polyurethane). Pebax is stiffer, lighter and more temperature-stable. Also, the C has a carbon powerstringer for more lateral support/stiffness.