ASICS Women&#39;s GEL-Kayano 15 Running Shoe,White/Navy/Ice Blue,5.5 B US,ASICS,T950N.0150" /> Synthetic and mesh Rubber sole Impact Guidance System (I.G.S.) enhances the foot's natural gait from heel strike to toe-off Asymmetrical lacing design enhances upper fit and comfort while minimizing the potential for irritation 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 DuraSponge outsole provides superior durability and cushioning with less weight, Solyte midsole material is lighter than ASICS' standard EVA and SpEVA and adds improved cushioning and durability Biomorphic fit upper provides a superior fit and function, ComforDry sockliner provides optimal cushioning performance in a cooler, drier, healthier environment