Lotto - ATP Challenge (White/Dark Blue) - Men's: Comfort and performance combine in the ATP Challenge. Supple, full-grain leather uppers and ENERTURN cushioning make for a comfortable ride - perfect for players and pros with long days on the courts. Upper contains a Microfiber Top with air vents. Dual-density ADAPTO heel counter sheet. Toe cap with "Reinforce" anti abrasion stiffener. Anti static lining. Modular anatomic tongue. Molded EVA midsole. ENERTURN cushioning system along entire shoe. Anatomic, removable EVA insole with Fibre-Dry anti-bacterial lining. Torneo last. LONGLAST 30 compound outsole with limited six-month warranty. PUNTOFLEX system uses a special technical device placed across the sole in the metatarsal area which allows correct foot flexion and excellent rebound. Shoe Weighs 14.5 ounces.