In short, Zero Gravity (zero G) gives the body a sense of weightlessness, decompressing the spine, relieving tension in the hips and pressure in the lower back. This is achieved by raising your head and knees slightly above your heart also creating a 120-degree angle between your torso and legs on an adjustable base.
It is worth noting this position will be slightly different for each person and can be adjusted and saved to the existing memory/preset positions i.e. ZeroGravity, AntiSnore, Memory etc. by holding the flat button and the desired save function i.e. Zero Gravity or Memory on an adjustable base.
Functionally to achieve or set this on a memory function base you will want to slightly raise the head to a comfortable position and raise your legs approximately 2.5cm higher than you head position measured on the equivalent position on your base i.e. the respective ends of the base or middle of the respective platform.
Suggested settings (measured from the bottom of the platform to the surround of the base).
Head 150mm
Foot 170mm