Professional Quality, Innovative Design Unmatched for quality and versatility, the Fitterfirst ProActive Disc is the leading FUNctional tool for active sitting, rehabilitation and exercise available on the market today. Fitter teamed up with Cascade Designs, a leading manufacturer of outdoor equipment including the popular Therm-a-Rest® brand, to bring you the innovative ProActive Disc. The ProActive Disc can turn any seating environment into an “Active Sitting Zone” and can also be used to perform balance board exercises, rehabilitation exercises, total-body workouts and stretches. Benefits : Strengthen abdominal and back muscles. Improve balance and posture. Enhance core stability. Improve circulation and spine stabilization. Enhance alertness. Relieve stress. Features: Therm-a-Rest® innovation combined with Fitterfirst quality. Self-inflating design. Adjustable inflation level with easy-to-use valve. Lightweight and portable. Durable for use indoors and outdoors. Versatile to allow active sitting, exercise and rehabilitation. Custom fabric for maximum comfort.