The charcoal tweed covered cushion has been designed to improve your posture and to offer relief to those who suffer with a tender coccyx. The 11° wedge angle is accepted as producing the optimum sitting position and correct posture. The cut-out at the back of the cushion allows the coccyx to be suspended without pressure. This cushion can also be used in a car seat as an infill. Size: 14" x 14"