Well, silk on one side, pure cotton on the other to be precise.
And thait's on top of our new seat. Superbly designed to offer an infinite number of confort settings including the ergonmically proven z position for sleeping, it exends to a flat length of 6 and is cocooned in a hard shell to provide you with uninterrupted slumber. With a host of other features such as a personal water bottle holder, privacy screen and indivdual reding light, where on earth could you be so comfortable.