Parabolic blades are standard blades with a thinner section in the middle. It is a additional feature that can be found on the following blades:
A Parabolic blade can only have a parallel side hollow. By making a blade parabolic you “remove” the side honed and taper feature.
Parabolic blades are simply thinner in the middle. The thinner section reduces friction and allows the blade to run for longer with less effort on the ice.
Parabolic vs Tapered
There are two ways to reduce the contact between the ice and the blade. One is Parabolic and the other is found on higher level blades and is called Taper. Unlike parabolic, where the midddle is thinner, taper is thiner at the end.