Primo Nord - Air 1017 - ArxusArxus Primo Nord Air is a boot which provides a high level of walking comfort with a focus on minimising condensation within the boot. This model is lined with a specially developed air feed system. The lining has a thickness of 1. 5 mm and sits above the textile brush mid layer which contains air cells. Below this is a further insulating layer of 3 mm neoprene. During use of the boot, if condensation develops it rises up the inside of the boot within