Organic Maternity Belly Belt for Active Moms-to-Be Tummy section expands for varying stages in pregnancy. Back support panel Breathable microfiber fabric woven with seamless technology. Fabric: 80% Natural Organic Cotton, 10% Polyamide, 4% Elastane. Global Organic Textile Standards (GOTS) certified. Sizing: Hip size 34.6"-37" (Small), Hip size 37.4" 39.8" (Medium), Hip size 40.2"-42.5" (Large), Hip size 42.9"-45.3" (Extra Large). NOTE: Sizing of this item is running small. We recommend ordering 1 size bigger for a more comfortable fit.