The Synchron Classic features a new compression molded EVA midsole which is current in most modern running shoes. The dual density construction remains true to the original version from the early 1990s. The upper features premium pigskin suede, synthetic overlays while the original mesh appearance remains true to the era. Most importantly, Karhu keeps the unique Synchron lacing structure which served as a way to tighten the forefoot upon repeated use.
