These women's Gel-Challenger 11 Tennis Shoes from ASICS are ideal for the recreational player whose main concern is comfort. Exclusive Rearfoot and Forefoot GEL Cushioning Systems attenuate shock so you can focus on your game. The Personal Heel Fit (P.H.F) uses memory foam in the heel collar for contoured comfort, while the Pguard toe protector increases stability on toe dragging.. Material: Textile & Synthetic Upper/Synthetic Sole