Ektelon Men's NFS Attack Synthethic Mid Racquetball Shoes (Red/black) synthethic Trusstic System: Reduces the weight of the sole unit while retaining the structural integrity of the shoe. NC Rubber Outsole: Compound containing more natural rubber content than traditional solid rubber, resulting in enhanced traction on court systems. Forefoot GEL Cushioning System (COURT): Attenuates shock during impact phase.