ASICS Women's GEL-Noosa Tri 6 Running Shoe 100% Synthetic and mesh Rubber sole Impact Guidance System (I.G.S.) ASICS design philosophy that employs linked componentry to enhance the foot's natural gait from heel strike to toe-off. Elastic Laces A classic triathlon feature allowing a runner to put the shoe on quickly, easily, and securely. Propulsion Trusstic