Allegro 7115-04 flexbak back support, x-large flexbak helps reduce back stress and strain with a design so unique it’s patented. Its three-part support is the key to a system that provides maximum back support with ease of movement. Because no two bodies are exactly the same, this 9″ medical-style truss uses two internal support panels above and below the waist surrounded by an elastic third panel. These combine to produce maximum bracing without pinching or riding up. Size x-large. Suspenders included.