I am disappointed with this product. I am a Pilates instructor and know the benefits of this chair for back issues, posture and the like. I am 5 feet 3 inches and with the chair assembled it is soooooo low to the floor I have had to place a large bed pillow under the ball to make it the appropriate height (knee to hip alignment) I wish there was a way to adjust the heigth. It is fine now but inconvenient.