Kensington Memory Foam Seat Cushion Black K55805WWThis ergonomic seat cushion from Kensington has been designed for additional support and comfort during long periods of sitting. The high density memory foam helps to provide structural support and it has been independently tested, confirming its ability to provide support and maintain thickness beyond 80,000 uses. Designed to help promote healthy posture, improve circulation and provide tailbone and lower back support, it has an anti slip backing and