Ideal for fast hiking in warm climates, the X Ultra Mid Aero combines fit, precision, and aggressive tread of X Ultra, with breathability and mid-height support that make it great for even the most rugged trails. . . . Open mesh and textile upper. . Gusseted tongue. . Sensifit(TM) for a precise and secure fit. . EVA shaped footbed. . Heel foam. . Heel strap. . Ortholite(R) sockliner. . Advanced Chassis(TM). . Mud guard. . Injected EVA. . Protected heel cap. . Protective rubber toe cap. . Molded arch shank. . PU coated leather. . Non-marking Cantagrip(R) outsole. . Imported. .