GOGO Waist Trimmer Belt, Abdominal Trainers, Durable and Comfortable Ab Belt for Women and Men Our size is not standard US Size. Please check our SIZE CHART in the description or image to get the perfect fit. Kindly suggest you to order two sizes up than what you usually wear. Material: Polyamid/Spandex. Stretchy waist belt creating the appearance of a flattening belly. Back support. Effective wavy fabric. Helps you keep good posture.