ASICS Sky Elite FF Men's Indoor, Squash, Racquetball Shoes Blue/Sour Yuzu : The ASICS Sky Elite(TM) FF indoor shoes are all about long-lasting energy return. The Sky Elite FF features special N.C. RUBBER(TM) on the outsole for premium abrasion resistance and superior grip that enables players to move quickly and confidently on the court. FLUIDRIDEA(R) technology and an ORTHOLITE(TM) sockliner offers lightweight, adaptive cushioning and a comfortable step-in feel. Upper: Features a lightweight, yet durable mesh material for comfort and support. Midsole: Features FlyteFoamA(R) and FLUIDRIDEA(R) midsole technology.Trusstic SystemA(R) reduces the weight of the sole unit while retaining the structural integrity of the shoe. Rearfoot GELA(R) Cushioning System attenuates shock during impact phase and allows for a smooth transition to midstance. Outsole: Solid Rubber outsole provides enhanced durability and traction.