Offered at the base of my husband who is a big chilly, I admit that I am not the last to enjoy. It's nice to come back not a cold bed! The 3 levels allow for the likes: 1: not cold; 2: Gently warm; 3: hot. On the lighter 30 to 45 minutes before going to bed, that way when we go to bed .... happiness. It's been a bit "old accessory" but frankly, I highly recommend it! What I reproach him missing a few centimeters in length and width, which would, firstly, that the entire surface of the mattress is heated, and secondly that the electrical boxes are less present. Ideally, they are the feet, but this is not possible because the wireless remote control is too short to have it at hand. The cases are not troublesome IF it but if they were not there, it would still be better. I have not washed, but the fact that it is washable is a big plus. A purchase I do not regret !!