I do not know what it is, at the Frankenstolz Kansas duvet or at Bierbaum mako satin bed linen, but I can not remember when I did the last time slept so well and so happy in bed. At a room temperature of only 17 ° C it is under the ceiling Rip-Rip warm and cozy. Not too hot, but very pleasant, well-balanced warm. We have now March and I will report how the combination beats at various temperatures during the year.