The shape of the chair is fine that it keeps your spine in a nice alignment. The low back is supported okay. The seat however is lame. The cushion flattens out when you sit in it and feels like a park bench.. Now I don't have much cushion to my butt either but there should be more padding in the seat. Maybe a firmer padding so it doesn't just collapse under weight. I'm 6 foot and 190 lbs. By no means should I be sitting on a hard seat. RUSSELL