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Running shoes are built on a “last” – a 3-D model of the foot that determines the shape of the sole. There are basically three shapes of last: straight, semi-curved and curved.
Straight-lasted shoes tend to be very stable, and thus appropriate for runners requiring motion control. Conversely, the greater the curve of the last, the more flexible the shoe is likely to be. These shoes are usually better suited to runners with high, relatively stiff arches.