Well, to explain my headline: The ceiling seems to be made of plastic in the interior and if you move it, it sounds a little as if we were lying on a plastic sheet. The blanket slipped constantly under the sheet, and thus I have it installed under the terms of the mattress with quasi into the mattress. This works quite well, but the heat is no longer quite as well but it still works very well. However, for therapeutic heat for back problems, the ceiling does not work so well. To get the bed nice Stay warm it is Top. No cold feet. Perhaps, therefore, for women even more suitable than for men;)
Small drawback: The coupling from the power cable does not hold very well, especially if the sides come train on what can happen in bed quite times. Then it in bed again icy ...
Overall, however, earned 4 stars. The value for money is definitely given.