Full Back comfort up to the lower neck on any chair you * Clinically proven to ease pressure on the lower back with its unique combination convex/concave design offers complete spinal support * Relieves back pain by realigning the spine and supports correct posture * Engineered shape confirms to natural spinal curvature * Cover features ventilation zones for added breathability * Contoured cushioning provides supportive comfort * 8-position height adjustable slider mechanism in the base allows height adjustment of up to 4 inches * Height adjustable from 23.5 to 27.5 * Width: 12.5 * Retail box measures 12.8 L x 4 W x 23.5 H *