Heavy, but comfortable
We bought 2 of these for long car trips.  Our tailbones ached after a few hours and shifting side to side did not help.  We tried other cushions, but found they added so much height you felt like your head would rub the roof.  This is heavy and stays put and is cooler.  I also use it on the riding mower and it cuts down on vibration and back stress.
Rating: 5 stars