The fluid moulds to the individual foot, providing support to the arch as well as the heel and ball of the foot. As the heel comes down, the pressure exerted on the foot, rather than pressing against something solid, is transferred into the fluid, pushing it forward so that, when the ball of the foot comes down, the fluid is there to absorb the impact and be pushed back to the heel for the next step. The insoles act like a shock absorber, relieving pressure on the joints.

This constant movement, pushing the fluid backwards and forwards across the foot, gently massages the muscles, increasing circulation, bringing more blood and oxygen to the legs and feet, and helping reducing tiredness caused by standing or walking over long periods of time. Trials in the US on liquid orthotics showed that, if used for 6h/day, the average increase in circulation to the feet and lower legs was around 53%.