Synergy

The cavities contain a filler (polystyrene beads, walnut husk...). The pump provides pressure or vacuum in the cavities. Filler is in three states: vacuum - tight, can be formed in accordance with the human body; atmospheric pressure - easy to change shape or bend in the form of boat contours: above atmospheric pressure - shell filler is not affected. For a more detailed description please see the attached pdf file. Аdditional variants 1. Lower pillows may be a few to expand the range of height adjustment. 2. Velcro fastener can be used for pads connection. 3. You can give up the air switch and permanently connected hose. Instead of setting one or two valves for each pillow