Stabilizing orthosis for relief of the pelvis and the sacroiliac joints. SacroLoc Back Support helps alleviate acute pain and helps prevent recurrences. It provides relief of deep-seated back pain through an effective combination of stabilization, relief and friction massage. SacroLoc is low profile and provides support to the lower back at the ilecsacral joints (where the tail bone meets the pelvis). SacroLoc can help alleviate acute pain that can come from sitting or standing too long. It provides stabilization and relief to the pelvis area through the tension straps and the inelastic knit fabric. It also provides a friction massage to the muscles and ligaments to improve circulation and improve muscle tone. Anatomically designed for highly secure positioning with every movement . It is unobtrusive and can be worn under clothing. Inelastic knit fabric provides stabilization to the pelvis and ilecsacral joint. Tension straps increase stabilization and can be individually adjusted for strain relief. Two-part friction pad with massage knobs provides a friction massage which promotes circulation and improves muscle tone. Straps with practical finger pockets makes support easy to apply. Knitted fabric and straps stabilize and relieve strain on pelvis and ilecsacral joints. Stabilizing combination of elastic and inelastic knitted fabric. Can be used to treat: Sacroiliac Joint Syndrome, Sacroiliac Joint Osteoporosis, Sacroiliac Joint Instability and Dysfunction, Irritation of the Sacroiliac Joint, Pain caused by sitting or standing for long periods of time. Size is determined in inches by loose pelvic circumference: Size 1 (27.5-33.5"), Size 2 (33.5-35.5"), Size 3 (35.5-39.25"), Size 4 (39.25-43.25"), Size 5 (43.25-47.25"), Size 6 (47.25-51.25") and Size 7 (51.25-55").