I don't know what it is but I can't sit in the chair for more than 2 hours before my rear hurts. The back is great and I like the headrest but I just can't keep it.
Sturdy chair - larger than I was expecting. Very comfortable with easy “pull up push down” lumbar support comfortable headrest back tension adjustable arms raise up or lower very easily and are “cushy”. So easy to put together - literally took longer to unpack everything! Only included Allen wrench needed for assembly. Love this!
I like the chair a lot. Very comfortable compared to the old chair I replaced. Easy to assemble also. The Staples employee that helped me choose the chair was very helpful and knowledgeable.