We had difficulty getting it on the mattress and thought we had ordered the wrong size. I called Customer Service and Ria was excellent. The measurements of the cover were indeed for our Futon size. She suggested we let it settle and maybe with sitting on etc it would smooth out. I think our mattress being older was not as pliable for such a soft material and it was very awkward getting the corners of the mattress in the cover. With much yanking stretching full force we finally managed to get it on reasonably well. Looks good in the room and hopefully  it will wear well.