I am selling these because I no longer use them. They have been worn many times, so there is a feeling of use. From the official website: * A two-layer structure of [in-heel] + [high-rebound cushion that absorbs impact when walking] for a soft and comfortable feel. * Total 6cm height with [4cm outsole] + [2cm insole] for excellent leg-lengthening effect! * The [2cm incline] provides a flat feel, making it less tiring and reducing the burden on the heels.