The Neo G Pregnancy Support Belt is a dual purpose support to be used during and after pregnancy. During pregnancy, it helps support the foetus (fetus) by providing light compression underneath your abdomen. It also supports the lumbar spine and sacroiliac joint, which are under significant strain during pregnancy. The support can be reversed (and once the metal inserts are removed) used after pregnancy to help support lax ligaments and muscles around the pelvis, reducing back pain post-pregnancy while the body regains its original shape. This support is breathable, adjustable, and slimline, allowing it to be worn discreetly under everyday clothes. SIZING GUIDE - To size, measure waist circumference (cm): Small: 60-70 cm; Medium: 70-85 cm; Large: 85-100 cm; X-Large: 100-115 cm; XX-Large: 115-135 cm.