The Podiatrist's Prescription for Pain Relief! Your feet go through a major workout every day. Without proper foot posture and support, your foot tends to roll inward, causing strain or pain in your heel and arch, or even your ankles, knees or lower back. Dr. Les Appel, designer of PowerStep, has created and prescribed thousands of customized arch supports over the past 30 years, for everyone from athletes to salesmen to skycaps. But not everyone needs or wants to pay the cost of customized prescription products. That's why Dr. Appel invented Powerstep. Powerstep is a unique podiatric support system specifically intended to relieve heel and arch pain, and prevent foot strain and injury. Unlike leading insoles or arch supports, Powerstep's unique 4-phase design is optimized to provide complete foot support and comfort, and correct foot posture and mechanics. - Strong prescription-like arch support, calibrated with flexibility for comfort - Unique double-layer cushion casing to enhance comfort from heel to toe - Heel cradle and Platform to stabilize / protect the heel during landing - Heat and slip reducing anti-microbial ETC fabric for dryness - PowerStep is available in more sizes than any other retail brand: Mens 3-14.5 and Womens 5-15.5 WARNING: These devices are not intended for people with severe foot deformities or suffering from circulatory diseases which result in infections or ulcerations on the bottom of the feet. In such circumstances, consult your podiatrist or medical professional before using. As with any product, consult a medical professional if pain persists. GUARANTEE: 30 day money back guarantee for any reason. Lifetime guarantee against breakage of plastic arch support (inside casing) when used under normal condistions.