They can be great for those who suffer with chest problems, or those that easily feel the cold. The one we have has an automatic shut-off so that if you fall asleep, it will turn itself off after about 15 minutes. It also has three levels of heat, and is generally a bit more sophisticated that the 'electric blankets' of old...
I have often been known to 'borrow' the various devices littered around our house to ease my bad back, or to ease my chest if I have a cold.
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