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 *