This duvet is made of a 100% fine cotton white tick with a filling of pure wool. The power of wool is that it keeps us warm in winter and cool during the summer. Wool absorbs humidity to 39% of its own weight which perspiration is reduced significantly. The pillow has a quilted 100% cotton patch with pure wool for optimum moisture regulation. The duvet and pillow can simply be washed in the washing machine, so very practical. A product is a luxury natural product. The 4-season duvets consists of two parts and is suitable for all seasons. The summer part is filled with 250 gr/m2 and the spring- and autumn part is filled with 450 gr/m2. The parts are easy to connect to each other by press buttons