FIT MEASUREMENTS - The SI Belt size fits hip circumference 47 - 56 inches and size REGULAR fits hip circumference 30 - 47 inches. Unisex design for men and women. The belt can be worn under or over your clothing. RELIEVES SCIATICA AND LOWER BACK PAIN - The adjustable hip compression SI brace will help support your lower spine and hips to relieve pain, pressure and stress caused by pelvic instability or SI joint dysfunction. The medical grade belt is designed to effectively stabilize and support your pelvis and hips. Simply the best solution for: back pain, hip pain, pelvic pain, upper leg pain, symphysis pubis dysfunction, pelvic girdle pain, piriformis syndrome or anterior pelvic tilt. ANTI-SLIP AND DURABLE - The SI Joint brace will stay in place, no matter what. The unique anti-slip material will make sure that your belt won t move around or ride up your hips. We also made sure to keep the material lightweight and very durable. You will have no problem wearing this belt for longer periods of time. Comfortably wear it around the house, during sports, other activities or even at night. EASY TO USE AND ADJUST - The smart design of this belt allows you to adjust the tightness and compression to your preference. Simply adjust the two elastic tension straps and get a tighter or looser fit. The strong hook & loop closures are equipped with smart tabs that make it super easy to unstick the straps. The belt is very easy to use, comes with clear instructions and is backed by our world class customer service