Browsing the Tush Cush web site the other day, I noticed that there's a sheepskin cover available. At first, I thought, "oh, I don't need that." I have several 13"x18" Tush Cush cushions, one for each of the places in the house where I sit. Even the ones I bought years ago are still in excellent shape. But then I thought, well, I think I'll go ahead and treat myself to the sheepskin version. And am so very glad I did. It is even more comfortable than the regular cover. This new cushion tips and aligns my back in just the right way and seems to 'hold' the tip-up position really well. Thanks, Tush Cush, for this ever-reliable and excellent product.