The SphereWind 4.0 Run Jacket with ­patented ThermoSyphon technology supports natural thermodynamics in sweat management and improves the thermo­regulation. The sleeves have been made more ergonomic: they do without underarm seams, have been preset as running sleeves and boast new cuffs that also support ventilation and are very comfortable. A newly developed, weatherproof air outlet on the neck allows excess warm air to escape without draughts.