ASICS Women's GEL-Sensei 3 Volleyball Shoe 100% Synthetic and mesh Rubber sole Impact Guidance System (I.G.S.) linked componentry that enhances the foot's natural gait from heel strike to toe-off GEL Cushioning Systems attenuate shock during impact phase and toe-off phases PHF (Personal Heel Fit) provides memory foam lined heel collar that molds to athlete's heel, creating personalized fit Biomorphic Fit upper provides a superior fit and function Solyte midsole material is lighter than ASICS' standard EVA and SpEVA, combined with improved cushioning and durability