ASICS Women's GEL-DS Trainer 14 Running Shoe 100% Synthetic leather and synthetic fiber Rubber sole Asymmetrical lacing design enhances upper fit and comfort while minimizing the potential for irritation Solyte midsole material is lighter than ASICS' standard EVA and SpEVA, combined with improved cushioning and durability Biomorphic Fit upper provides a superior fit and function 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