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100% Sorbothane. Accepted by the APMA. Proven Over 1 Million Steps.
Sorbothane is a visco-elastic polymer — accepted by the American Podiatric Medical Association and used in precision engineering applications worldwide, including NASA equipment protection. Unlike natural rubber (which returns energy to the system and causes high rebound) or butyl rubber (which reduces impact but creates linear force), Sorbothane converts impact energy into harmless heat through high hysteresis.
The Balance Correction Map demonstrates measurable pressure redistribution after wearing Heel Pad XC: weight shifts to the ball of the foot and the centre of the heel, correcting overpronation and reducing pressure concentration at high-stress zones.