I got 2 chairs and soo Impressed with these zero gravity chairs. No need to install, just open and sit. Light weight and awesome quality. You can Sit and Sleep. Its best replacement for Recliners. Really enjoying, We can use anywhere. Multipurpose. Also, it has lock to fix the position. Headrest cushion also good and smooth. It flats up to 160 degrees , best position to lay down. Low price compare to others.