ASICS Women's GEL-Nimbus 12 Running Shoe Synthetic and mesh Rubber sole Impact Guidance System employs linked componentry that enhances the foot's natural gait from heel strike to toe-off Space Trusstic Systemcreates a pocket between the Trusstic System device and the midsole, allowing for controlled midsole deformation and more efficient foot function ComforDry Sockliner provides cushioning performance and anti-microbial properties for a cooler, drier, healthier environment Biomorphic Fit Upper is strategically placed on the upper to reduce buckling and the potential for irritation Asymmetrical Lacing Design reduces potential for irritation and provides improved comfort and fit