ASICS Women's GEL-DS Trainer 15 Running Shoe 100% Synthetic and mesh Rubber sole Impact Guidance System enhances the foot's natural gait from heel strike to toe-off Propulsion Trusstic mimics connective tissue in the foot by creating tension as foot enters propulsion stage Gender Specific Space Trusstic System, recognizes the normal periodic changes in the shape of the woman's arch and provides for the controlled deformation of the arch into the space within the system Biomorphic Fit upper reduces buckling and the potential for irritation Asymmetrical lacing design is an anatomically correct environment that reduces potential for irritation and provides improved comfort and fit