We had a couple weeks with our new Tempurpedic bed before we got the mattress protector. Some of the reviews had me concerned that it would be very noticeable and shift around, etc. This has not been the case for us. It stays put, doesn't make a sound, and Our mattress is just as wonderfully comfortable. And now I can sleep even more soundly knowing we've protected our investment with a cover that was made especially for it.