These AFD plates only work with the Cast Freetour System.
The Alpine AFDs will fit all alpine boots that meet ISO 5355, this includes boots that have CAST’s tech conversion. WTR AFDs will fit Walk to Ride boots, they are also sized to accommodate boots that meet ISO 9523 touring boot standard. However, the release and retention characteristics of these boots will be affected by the boot’s sole material and tread pattern. AFDs compatible with GripWalk will fit all boots with GripWalk soles. Due to the limited overlap between Alpine and GripWalk geometry, Cast chose to design these AFDS to create maximum energy transfer and more consistent function specifically for the GripWalk norm, as a result, they will not work with Alpine boots.