On's flagship marathon racer, rebuilt around a new CloudTec Sphere geometry that lets the midsole foam compress and rebound more freely. An updated Helion HF superfoam pairs with a lighter, stiffer carbon Speedboard plate for an efficient, propulsive roll through the stride, tuned specifically for long-distance race pace.
A 40mm heel stack and 5mm drop keep the shoe within World Athletics regulations while delivering serious underfoot protection, and a full-coverage rubber outsole adds durability across race distances.
Best for runners chasing a fast half or full marathon who want a stable, efficient super shoe rather than the softest or bounciest option on the market.
