ASICS Men's Gel-Challenger 9 Tennis Shoe 100% Manmade Imported Rubber sole The GEL-Challenger&reg; 9 from ASICS&reg; provides exceptional comfort&#8212;making this the perfect choice for the avid tennis enthusiast! Synthetic leather and mesh upper materials provide enhanced breathability and flexibility. Padded collar and tongue. P.H.F.&reg; (Personal Heel Fit)&#8212;two layers of memory foam line the collar and mold to the athlete's heel&#8212;creating a personalized fit. Removable EVA insole. Traditional lacing system for optimum fit. PGuard&trade; Toe Protector for enhanced toe durability. Solyte&reg; midsole material&#8212;a lighter weight midsole compound than ASICS standard EVA and SpEVA&reg;&#8212;for enhanced cushioning and durability. Rearfoot and Forefoot GEL&reg; Cushioning Systems attenuates shock during impact and toe-off phases and allows movement in multiple planes as the foot transitions through the gait cycle. A hidden Trusstic System&reg; reduces