Add a cushion to the top of any Alera? Pedestal or Low Credenza for instant seating. Soft resilient foam covered in soft long-lasting fabric. Rubber grip bottom surface holds cushion in place without slipping; but easily repositionable. Two inch think cushions offer just the right amount support. Pedestal File Seat Cushion. General Category: Seating Accessory; Sub-Category: Seat Cushion; Color(s): Smoke; Color Family: Gray.