The Serola Sacroiliac Belt is the ideal tool being used to provide pain relief and help prevent injury to the lower back, sciatica and sacroiliac joint. The sacroiliac joint (SIJ) is the joint between the sacrum and the ilium bones of the pelvis. The sacrum supports the spine and is supported in turn by an ilium on each side. These belts support the trunk, pelvis, and hips better than any other belt, taking the pressure off the joint which results in pain reduction, effectively stronger muscles and better circulation. The Small is recommended for those with 30"-34" hip measurements. The Medium is recommended for those with 34"-40" hip measurements. The Large is recommended for those with 40"-46" hip measurements. The X-Large is recommended for those with 46"-52" hip measurements. Ready to feel better? These belts offer relief for back pain, hip pain, symphysis pubis dysfunction, pelvic girdle dysfunction, piriformis syndrome, upper leg pain, pelvic pain. The 3" wide belt is designed to compress and support the sacroiliac joints relieving stress and instability. The Sacroiliac Belt can be worn 24/7, even while sleeping. Wearing the belt for long periods of time will not cause any negative effects. It’s safe for all as the belt is breathable, moisture-wicking and hypoallergenic. For cleaning, hand wash only in hot or cold water. Rinse well to remove soap residue from the small open cells in the foam. Air dry.