Like a good fitting pair of shoes, the Nada-Chair back slings should fit snugly but not too tightly. Much of the adjustment is self-corrective. If you feel uncomfortable over time, simply loosen the straps slightly. The goal is to keep the low back supported just enough to prevent the sagging that leads to back pain. It is recommended to vary the support by alternatively tightening and loosening the straps when you are sitting for longer periods.