ASICS Women's GEL-Phoenix 2 Running Shoe 100% Synthetic and mesh Rubber sole California slip lasting offers stability and comfort, and its removable sockliner can be taken out to accommodate orthotics DuoMax Support system enhances support and stability, and is positioned sport specifically, reflectivity materials enhance visibility during low light hours Rearfoot GEL Cushioning System attenuates shock during impact phase and allows for a smooth transition to midstance, and ASICS High Abrasion Rubber is placed in critical area of the outsole for exceptional durability SpEVA Midsole material improves bounce back characteristics and decreases midsole breakdown Trusstic System reduces the weight of the sole unit while retaining the structural integrity of the shoe, ASICS High Abrasion Rubber is placed in critical area of the outsole for exceptional durability