The supportive PWRCAGE saddle unit that wraps around the medial and lateral side of the shoe, is integrated with the midsole providing the proper fit and support. As the DISC lacing system tightens the cage around your foot, the Heel Lock Window cups your heel comfortably locking your foot securely into the shoe. The layered Adaptive Fit System provides 360-degree support through the internal bootie, while the external bootie, layered with PWRFRAME, ensures the foot is fully supported in high-wear areas. The full-length IGNITE Foam cushioning platform and PWRADAPT Technology provide responsive comfort and 3-dimensional traction that adapts to the way you move. More Traction + More Comfort = PWRADAPT.