Insole: Removable VGS Motion Sensor Dual Density Polyurethane Footbed with Memory Foam. Midsole: Compression Molded EVA with Impact 300 Gel Heel Insert. Shank: Engineered Composite. Outsole: Dual-Density Multi-Surface ''Z-TRAK'' Rubber with Integrated Shock-Absorbing Comfort Pads.