Unique cut-away contours slope away from pressure points at the tailbone. Wedge shape helps promote proper seating posture. Supports the lower back & spine. Softly curved upper edges reduce stress on pressure points by gradually tapering away from user. Unique center channel averts pressure on spine. Helps to maintain the spine's natural S-shaped curve. General Category: Seating Accessory; Sub-Category: Seat Cushion; Color(s): Black; Color Family: Black.