preowned Rearfoot GEL Cushioning System Attenuates shock during impact phase and allows for a smooth transition to midstance Ortholite Sockliner Moisture management Outer Material: Synthetic Sole: Rubber Closure: Lace-Up Heel Type: low-heel Material Composition: synthetic AmpliFoam Midsole Engineered to maintain durability at softer densities, providing better flexibility, comfort, and platform adaptability ideal for natural running.