26 inches across the top of the inverted triangle. Approximately 12 inches to the bottom of the triangle from the top center. Hook & Loop closure is approximately 4 inches on both sides allowing for adjustments. Made from 100% cotton interlock fabric (stretching lengthwise) for comfort and breathability. One size fits most. Designed and Manufactured in the USA. Comfortable, durable, breathable, washable and 100% cotton interlock fabric. Not medical grade.