ASICS - Gel-Challenger (White/White/Baby Blue) - Women's: The Gel-Challenger is a solid performance tennis shoe. GEL Cushioning System minimizes shock, provides maximum rearfoot and forefoot shock attenuation. AHAR(R) Plus offers ASICS(R) high abrasion rubber. RhynoSkin(R) provides increased upper durability. PHF(R) Personal Heel Fit is a memory foam lined heel collar that molds to the athlete s foot, creating a personalized fit.