The ideal insole for complete foot support, comfort, correct posture and mechanics. Invented by podiatrist Dr. Les Appel PowerStep, is a unique foot support system intended to help relieve heel and arch pain, while preventing foot strain and injury. A full-length, prescription-like flexible polypropylene arch support is embedded in a double-layer polyethylene cushion casing. The result: control for feet rolling inward (over-pronation), which can pull the entire lower body out of alignment. A special Sanitiz fabric cover reduces slippage and heat, helping keep feet drier. Please specify Men's/Women's shoe size. Cannot mix sizes for quantity discount.