ASICS Women's GEL-Kushon 2 Running Shoe 100% Synthetic and mesh Rubber sole Rearfoot GEL Cushioning System attenuates shock during impact phase and allows for a smooth transition to midstance Trusstic System reduces the weight of the sole unit while retaining the structural integrity of the shoe Compression molded EVA midsole attenuates shock throughout the gait cycle. AHAR technology provides exceptional durability