S: Lower Back Circumference (in) 31.5 - 43.3 M: Lower Back Circumference (in) 35.5 - 47.3 L: Lower Back Circumference (in) 41.5 - 51.3 XL: Lower Back Circumference (in) 45.3 - 55.1 How to Measure for the Perfect Fit: Locate the Correct Measuring Point: Use a soft measuring tape to measure the circumference around your belly, about 1 inch (2–3 cm) below your belly button, which is typically the widest part of your abdomen during pregnancy. 2. Check Our Size Chart: Once you have your measurement, refer to our detailed size chart in the product description to select the size that best matches your abdominal circumference. If you are between sizes or close to the upper limit of a size range, we recommend sizing up for better comfort and adjustability. Consider Pregnancy Progression: If you’re in the early stages of pregnancy, keep in mind that your belly will continue to grow. In that case, you may want to choose a size that gives you room to adjust Pregnancy Support Belt Maternity & Postpartum Band - Relieve Back, Pelvic, Hip Pain Pregnancy Support Maternity Belt, 3 in 1 Maternity Belly Band for Pregnant Women, Breathable & Adjustable Belly Band for Pregnant Women For all stages: Whether you're in pre-motherhood, post pregnancy, or late stages of maternity, pregnancy pain and weight stress is taxing, and our pregnancy belt will provide you much relief! For all sizes: This adjustable maternity support belt provides pelvic, abdominal, and back support and will relieve back and pelvic pain regardless of size or shape. For freedom: Our pregnancy support belt will free up your hands, the added tummy support will relieve you from constantly holding your belly upright while performing sports, working out, or other daily activities, you will gain more movability and free range.