Because the comfort layers are all on one side, today’s Sealy Posturepedic mattresses do not need to be flipped. Instead, they should be rotated occasionally to help minimize body impressions in the upholstery layers. Remember, body impressions are a normal occurrence in new mattresses and indicate that the upholstery layers are conforming to your individual body contours. Sealy Posturepedic UniCased Edge design ensures that your mattress retains its shape and comfort year after year.