The Cushion seat pad is made of polyester and filled with hypoallergenic foam material allowing the user to be comfortable when seating you will not receive any type of allergies, this cushion is safe and healthy. We understand when seating you do not want to slip off your chair hence why we have added ties at the back of the Adirondack cushion pad allowing it to be tied to the chair rungs which prevents it from slipping. The measurements of these chair cushions are approximately: Part 1- 80cm x 53cm x 5cm, Part 2 - 53cm x 53cm x 5cm, allowing the cushion seat pad to fit onto your Adirondack Chair perfectly.