The 3 zones Wärmeunterbett I can only recommend. Switched on at level 3 for 30 minutes before going to bed, you have warmth throughout the bed. After 2 hours the underblanket switches off automatically, very handy! Is the bed once preheated, the level ranges from 1 completely, keep it cozy and warm. When lying one does not feel the Wärmeunterbett. I wonder why I have long hesitated with buying :-)
