The concave-convex support belt relieves the pressure on the lumbar spine of pregnant women, reduces the vibration of activities, and stabilizes the fetal position. The inner strap should be attached around the lower abdomen, and there is enough space to stick it; the outer strap protects the waist, pull the Velcro on both sides, and stick it to the inner strap.Adjustable Features Breathable Comfort Waistband for Pregnant Women - Don't worry about the sweat, friction and unbearable pressure that most belly waistbands cause. Our pregnancy support waist keeps you cool, comfortable and fully mobile, and you can easily adjust it.76% polyester, 24% spandex Washing methodHand wash, not machine wash, do not tumble dry Maintenance methodRemove when not in use, lay flat by hand There are further support straps. Consists of three components, stable triangular structure, adjustable range size. Size XXL: Fits Abdominal Circumference: 110-140cm.