Breathable materials wick away body heat and sweat. Especially during physical activity, this prevents overheating or a clammy feeling. The higher the breathability, the better the jacket performs during intense activities. Breathability (MVP): up to 10,000 Breathability is measured as MVP: Moisture Vapour Permeability. This value indicates how many grams of water vapour per square metre of fabric can escape in 24 hours. The higher the MVP, the better the jacket’s breathability.