I received my sample of the Bounce dryer bar but have yet to use it. This is because there is a warning on it not to use on Kid's PJ's, as it may lower the effectiveness on the fire retardation that is in the PJ's.  This warning isn't on the normail ALL dryer sheets I use so I am not sure what is in the bar that causes the protection to detoriorate, but I don't have the time to make sure that there isn't a pair of my son's pj's in the particular load I am doing and if there is make sure that the bar has been taken out of the dryer.  Too much of a risk to use this product for me!