World Cup Racing Fit The lower part of these liners is pre-shaped around the ankle bone to ensure a snug fit with the shell’s internal last. The shape can be seen on the outside of the liner. Dual Core Technology DUAL CORE technology involves injecting materials with different hardness levels into the same mould, with three injection points in the shell and two injection points in the cuff. The result is a sandwich construction with an ultra-thin layer of hard materials on the outside encapsulating the softer materials inside. Liner Tech
