The AirZone Pro is designed to be a four season hillwalking and lightweight trekking, it is absolutely rammed with special features, first and foremost is the most distinctive aspect about this bag and indeed its namesake, the AirZone cut out. The idea behind this is that it keeps as much of your body away from the rucksack allowing your skin to breathe, keeping you cooler and less sweaty, the parts of the bag that are touching your back are made from a breathable mesh this also reduces the weight and is anatomically shaped for increased comfort.