ASICS Men&#39;s GEL-Challenger 7 Tennis Shoe,ASICS,GEL-CHALLENGER 7 (bad asin)" /> Synthetic and leather Rubber sole 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 PGuard Toe Protector enhances toe durability Personal Heel Fit has two layers of memory foam that line the collar and mold to the athlete's heel, creating a personalized fit Solyte Midsole Material features enhanced cushioning and durability