ASICS GEL-CHALLENGER 14 TENNIS SHOE - MEN'SThe GEL-CHALLENGER 14 tennis shoe creates the stability you need when you're covering the baseline, so you can keep your mind focused on controlling the point.FEATURESThe outsole also features a separated heel construction to help you experience better stability during abrupt landings. TECH SPECSThe sockliner is produced with the solution dyeing process that reduces water usage by approximately 33% and carbon emissions by approximately 45% compared to the conventional dyeing technology