"Help improve your core strength, flexibility, and balance, with our complete line of professional -quality accessories. FitBALL Wedge is used as a posture correcting seat cushion or a lumbar support, the inflatable FitBALL Wedge encourages proper alignment with its dynamic wedge shape. Comes in a smooth surface on one side, with sensory points on the other. It is comfortable, portable, inflatable and adjustable! Dimensions: 13.5"" L x 13"" W x 3"" H Weight: 3.4 lbs."