Sit comfortably for hours while you quilt, sew, read, drive, craft, and more. This softly inflated, flexible disc helps to prevent fatigue and reduces pressure on the tailbone. The nubby "finger" texture allows cooling air flow, and promotes improved blood flow. Durable rubberized material remains soft and pliable. Measures approximately 13" in diameter and 2" thick. Dimensions: 13.4 in. h x 13.4 in. w x 2.7 in. d Weight: 2.34 ounces.