Mom was right - slouching can cause back pain and discomfort. The McKenzie Original D Roll ensures correct and natural positioning of the lower spine while you're sitting, which improves your posture. Improved posture means improved low back support. Specialists and therapists agree with mom - improper sitting positions can cause significant additional disc pressure in the lumbar spine. With our McKenzie D Roll, your body will be positioned so you sit up properly. You'll love the way your back feels with the McKenzie D Roll. Comes with attached elastic strap.