I laugh when I see the comment saying that it is not the size of the mattress! Either this is a mistake of the merchant ... but I doubt either people do not have patience or savvy !! It is difficult to find the right side of the first shot, because not install it is very retract !!! so if we see that it is too small and although we say that we can be the width in length! And put out the corner of the cover in the corners of the mattress, not to seek to draw as much as possible from below !!! Obviously it does not fit perfectly to the mattress, it is hollow! In short, order it safely ;-)