“When seated, you should be able to feel your sit bones on the seat. That’s another way of saying that flesh is not supposed to be load-bearing; bones are. This means that both sitter and designer should avoid deep padding for sitting. An over padded chair forces the sit bones to rock in the padding rather than make contact with a stable surface, thereby forcing the flesh in the butt and thighs to bear weight.
Why Too Much Padding On A Chair Is A Bad Thing