Just great, this 4 season duvet! Top Quality, really warm and fluffy! The bed is really very warm, if you use both ceiling together, so that's really something for people who like to have it snug and cozy in the winter! Nevertheless, one does not sweat and the sleeping environment is very pleasant! Good Feutigkeitsregulierung the fabric! The thicker of the two ceiling is good for transition periods spring and autumn and the appropriate thinner is certainly great in the summer - I could not test, however! I would highly recommend this bed!