The Spira® Scorpius Stability Runner provides support for the moderate to extreme pronator by incorporating a wide heel platform and an extended high density medial post. Stability and cushioning are combined without compromising comfort. Newly designed WaveSprings in the forefoot and heel provides superior cushioning a resilient at half the weight.* A rigid TPU shank offers midfoot support and stability. The Dynamic Fit System™ adjusts to the changing dynamics of the instep during the gait cycle. The foot-bed may be removed to accommodate orthotics.