ATK EVO Freeride Spacer (AL13) R11, R13 or FR15 (pair)ATK Freeride Spacer For R11, R13, FR15 spacer for ski bindings is the top of the range. By comparing the tech and alpine ski bindings, one can appreciate how the toe box of the former is much more precise and rigid than the latter. The same cannot be said for the heels, where the 'tech' sole does not press on the ski like in the alpine binding. The new adjustable FREERIDE SPACER has overcome this gap, guaranteeing more precise skiing than any other