They start out big and fluffy (black label) when you go to bed, 1/2 an hour later they are about 2" thick and your neck starts to hurt. Worse that sleeping on a lumpy mattress.
They are overpriced and overhyped. If you didn't have neck problems before you tried a MyPillow, you will have them after you try one. Little chunks of foam rubber somehow try to suffocate you through the pillow fabric are very annoying. You can't sleep all night without having to fluff it up many times.
You will lose sleep trying to get comfortable with all tossing and turning. Save your money as they are not worth the cost.
Review about: Mypillow Pillow.
Reason of review: Bad quality.