All elastic 10″ wide back support features 4″ wide single tension strays which extend and close over the abdomen to provide abdominal support as well as lumbosacral support. Flexible plastic stays in back panel. Front closure with hook and loop. Specify size: (hip circumference) Small 30″-33″, Medium 34″-36″; Large 37″-39″; X-Large 40″-42″.