ASICS Women's GEL-Resolution 2 Tennis Shoe 100% Synthetic and mesh Rubber sole Impact Guidance System enhances the foot's natural gait from heel strike to toe-off Solyte Midsole Material features enhanced cushioning and durability, Pguard Toe Protector enhances toe durability Rearfoot and Forefoot Gel Cushioning Systems attenuate shock during impact phase and toe-off phases and allows movement in multiple planes as the foot transitions through the gait cycle Biomorphic Fit upper reduces buckling and the potential for irritation Personal Heel Fit has two layers of memory foam that line the collar and mold to the athlete's heel, creating a personalized fit