2. The spreader bars open the hammock chair: the longer the spreader bar the more elbow-room and the more freedom of movement for the body, also allowing a wider variety of sitting positions.
3. The length of the seat (for woven hammock chair this represents the width of the cloth from selvedge to selvedge) determines primarily which parts of the body can be supported.
What you should know:
100-130cm seat length = Hammock chair allows room for back and backside.
140-170cm seat length = Hammock chair has plenty of room for back and backside, head is supported.
180cm+ seat length = Even the legs fit in to the chair.