The Synchron serves up the steadiest “roll” in Karhu’s running collection. Ideal for neutral to late stage overpronators and those looking to go the distance, the upper of the Synchron features an engineered IdealKnit mesh with enhanced breathability as well as Karhu’s signature asymmetrical toebox lace. The new 2.0 version brings up some fresh new additions too, serving up a repositioning of the Stingray Fulcrum combined with a lighter, softer blend of AeroFoam Nova to produce a more flexible, runnable midsole. With an underfoot that’s engineered to protect and support, the Synchron is ideal for long days and longer runs and esnures a soft, stable ride – whatever you’re up to.
- Ideal use: Road running and the gym
- Gait type: Neutral to late-stage overpronators
- Materials:
- Upper: Breathable IdealKnit mesh
- Midsole: AeroFoam Nova
- Outsole: Full-contact rubber
- External Stingray Fulcrum: More pronounced “roll”
- Flexible, runnable midsole
- Protective, durable design
- Asymmetrical toebox lace
- Soft and stable ride
- Maximum support
- Lightweight
- Heel-Toe drop: 15mm
- Weight: 300g





















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