ASICS Women's GEL-Cumulus 12 Running Shoe 100% Synthetic and mesh Rubber sole Impact Guidance System employs linked componentry that enhances the foot's natural gait from heel strike to toe-off Gender Specific Forefoot Cushioning provides a cushioned platform feel in the forefoot Rearfoot and Forefoot GEL Cushioning System attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle ComforDry Sockliner provides cushioning performance and anti-microbial properties for a cooler, drier, healthier environment, Solyte Midsole Material is a lighter weight midsole compound than ASICS? standard EVA and SpEVA