Pain and injury to the legs, including the hips and knees, may be helped in a variety of ways by Z-CoiL® footwear. The shock-absorbing coil in the heel reduces impact to painful joints by up to 50%, compared to conventional shoes. The coil can also automatically adjust your stance to accommodate minor leg length discrepancies, keeping the hips level and the spine better aligned. The Z-Orthotic™ built into each shoe helps to further stabilize the foot. When the foot does not over-pronate (roll in) or supinate (roll out), the knees and hips are less prone to twist. The rocker-bottomed sole on Z-CoiL® shoes also reduces stress on the knee joints by promoting a smooth, rolling gait.