Proven Effective This design automatically holds your foot in the optimal position for providing a biomechanically accurate and efficient stretch proven to work the lower leg muscles more effectively.Customizable Stretch Unique adjustable heel rest allows you to increase or decrease the degree of stretch, to “progress your stretch” as you become stronger and more flexible.Exclusive Toe Stretch Removable toe lift delivers maximum toe and plantar fascia stretch, perfect for engaging the entire interconnective chain of the lower leg for unparalleled results.