ASICS Men's GEL-Equation 4 Running Shoe 100% Synthetic and mesh Rubber sole Contains reflective materials designed to enhance visibility during low light hours California Slip Lasting offers stability and comfort, AHAR High Abrasion Rubber is placed in critical areas of the outsole for exceptional durability Removable sockliner accomodates orthotics 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