Specifications 6 l 640 g 23 x 44 x 6 cm air flow contact system the requirement here is to transfer loads to the bodyrsquos centre of gravity such that they become neutral while at the same time minimising the contact areas with the back we solve this contradiction by means of a back component where all ventilation components such as large ventilation channels and specially grooved and perforated eva pads behind mesh material have practically been moved to the inside this ensures that the