Flexbak helps reduce back stress and strain with a design so unique, it’s patented. Its three-part support is key to a system that provides maximum back support with ease and movement. Because no two bodies are exactly the same, this 9”(22.8 cm) medical-style truss uses two internal support panels above and below the waist surrounded byan elastic third panel. These combine to produce maximum bracing without pinching or riding up and stays deliver firm, continuous lower back and abdominal support. Hand washable.