The NOVA Happy Tush seat cushion uses gel cell technology with 2 inch double layer offset cells to take comfort the pressure points and allow for optimal circulation while seated.The Happy Tush is durable and water resistant.  Its black polyester cover is zipper removable and washable with a convenient carrying handle and slip-resistant bottom.  Perfect for home, office and travel. Cushion rolls up and folds up to pack and take anywhere.  Dimensions are 16.5 in x 14.25 inch x 2 inch.  Cushion also comes in an extra wide version measuring 19 in x 17 in x 1 in.