The RH Logic 400 design is inspired by the human form, and by two joints in particular - the knee and the hip and is excellent for people who need to be able to spend periods of the day resting and periods of the day active.
 
One of the best things about the fluid mechanism on the Logic 400 range is the minimal movement of the front of the seat when leaning backward - Your feet remain in contact with the floor, minimising pressure on the underside of your thigh.
 
This makes the Logic 400 our recommendation for those looking for easy circulation - minimising achey legs.

Additionally the backrest height remains constant regardless of the seat angle so the lumbar support is always in the correct position.
The Logic 400 has a high backrest with padding to provide support between the shoulders and pronounced support for the curve of the back to provide optimum sitting comfort. The backrest narrows towards the top to allow greater freedom of movement for the arms.
 
You will notice the effect as soon as you sit down. First of all, the vertical movement of the front of the seat is minimal when leaning backward or forward. Your feet always remain in contact with the floor, minimising the pressure against the underside of your thighs, which eliminates numbness due to restricted blood circulation. Secondly, the backrest height remains constant, regardless of the seat angle. Consequently the lumbar support is always in the correct position, which helps facilitate an upright posture.