The Futura Pros are spacious companions for extended multi-day treks. The Aircomfort Flexlite Pro System brings together three key elements which work to full advantage when your dream trip necessitates carrying a bit more gear: fantastic Aircomfort ventilation, flexible carry comfort and a comfortable, snug hip belt. The key to this clever combination lies in the Aircomfort Flexlite frame construction and the floating Vari Flex hip belt. For female alpinists, the SL modes feature specialy tailored shoulder straps and hip fins.