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“Podiatrist and biomechanical expert Simon Bartold, known for his work with ASICS from 1983 to 2013, has come on board to help design the new line. At a September launch event in Santa Cruz, California, Bartold explained how they have mapped the vibrations for different structures in the leg and are working on reducing key frequency ranges that can lead to fatigue and injury. The fine tuning is still a work in progress, but the initial work is integrated into the midsole design of the Sonic.
What that looks like is a segmented midsole that isn’t glued together, blocking vibrations from travelling throughout the structure and containing them in smaller “pools”. A high rebound EVA midsole surrounds heel and forefoot pads made of a proprietary PU-based material that is light, cushioned and bouncy. The shoe also features longitudinal flex grooves aligned along key axes of the ankle joint, designed to allow a natural rolling motion. The location of these grooves will change in the different models of the line, altering the percentage of support to the medial and lateral sides underfoot. None of the shoes will pretend to provide “motion control,” however, a concept Bartold believes should be “flushed down the toilet”.

http://reader.mediawiremobile.com/formula4/issues/109113/viewer?page=3

 

By ankle axes, are they talking about variations in the subtalar joint axes?

 

would assume they are talking about the ankle axes, especially because they mention the rolling motion

 

Salomon Gets Some Road Vibe-Vibe Cushion Explained, First Runs Review Salomon Sonic

 

The sonic is to stiff. The are many better shoes than this one.