Asics Gel 160 Trail Running Shoe Womens Rearfoot GEL Cushioning System: Attenuates shock during impact phase and allows for a smooth transition to midstance SpEVA Midsole Material: Improves bounce-back characteristics and decreases midsole breakdown DuoMax Support System: A dual-density midsole system positioned to enhance support and stability, positioned sport specifically Trusstic System: Reduces the weight of the sole unit while retaining the structural integrity of the shoe Removable Sockliner: Accommodates a medical orthotic