DUOREST GOLD chair is a fully adjustable chair; the width and height of the backrest can be adjusted to suit the user's body shape. Dual backrests move in three dimensions in response to the user's movements to support the spine and back muscles, keep the posture straight and distribute the weight evenly over the body muscles to minimize back strain. The Self Tension Tilting Mechanism is applied to the chair so the user can recline back and has a seat movement featuring a 4:1 back to seat tiltin