ASICS Women's Gel Challenger 10 Tennis Shoe 100% Synthetic Imported Rubber sole Shaft measures approximately 2.6" from arch PGuard Toe Protector Synthetic Leather and Mesh Upper Rearfoot and Forefoot GEL Cushioning Systems: Attenuates shock during impact and toe-off phases, and allows movement on multiple planes as the foot transitions through the gait cycle. P.H.F (Personal Heel Fit) Collar Lining Solyte Midsole Material: A lighter weight midsole compound than ASICS' standard EVA and SpEVA. Also features enhanced cushioning and durability.