preowned The New GEL-Kayano 23 shoe features our Dynamic DuoMax Support System, set at an angle to support and engage the foot only when required. With improved fit, the new shape not only holds your heel better, it holds the entire foot better while providing superior toe spring. Convergence GEL Technology and FlyteFoam Technology make the new lighter-weight, innovation in the GEL-Kayano family our greatest adaption yet.