Gel Seat Cushion features:

• Unique gel grid design provides
  different zones of comfort and support
  for a luxurious sitting experience
• Dense gel at front and back provides
  firm support to help you sit upright
• Softer zone in the center for cushioned
  comfort of the sitting bones
• Mesh center allows for increased air
  circulation to keep you cooler
• (L) 18.5”x (W) 2” x (H) 17”
  (L) 46.99cm x (W) 5.08cm x (H) 43.18cm