The Jay® J2TM wheelchair cushion can generally be categorized as a gel cushion due to its pressure-distributing gel-filled pouch component. Sunrise Medical—the manufacturer of this product—specifies this cushion as follows.
The optional plywood board - the rightmost element in the picture - is sold separately (it does NOT come with this cushion). Sunrise Medical's "ballistic stretch" cover comes with this J2 wheelchair cushion.