ASICS Women's GEL-Landreth 6 Running Shoe 100% Synthetic and mesh Rubber sole Impact Guidance System (I.G.S.) (RUNNING) ASICS Design Philosophy. Employs linked componentry that enhances the foot's natural gait from heel strike to toe-off. Clutch Collar System A descendant of the Heel Clutching System, an Endoskelatal collar compliments the exoskelatal heel counter for a uniquely secure fit. Gender Specific Forefoot Cushioning