In the four natural warm materials of cotton, wool, silk and down, the down warmth is the best.
Li Shizhen, a great medical scientist in China, also mentioned in the "Compendium of Materia Medica": "The selection of goose fluff is the clothing, the flocculation, soft and new cold, especially the pain of the baby." The duvet in the past two years in China Popularization speed is very fast, well-known duvet brands, Ailei Home Textiles, Rollei, Mercury, etc. are explained by modern viewpoints. The health function of duvets is determined by the unique soft and warmth of the down and the good performance of moisture absorption and divergence. From the perspective of warmth, the results of research published by French research institutions suggest that:
At present, there is no warmth in the world that exceeds the warmth of down, because the down is a star-like structure. Each piece of fluff can be seen as a fish scale under a magnifying glass. There are countless tiny pores, which contain a large amount of static. Air, due to the lowest air conductivity, forms a good warmth of down, plus the feather is full of elasticity, with a down rate of 50% down, its light bulk is 2.5 times that of cotton and 2.2 times that of wool. Therefore, the duvet is not only gentle and warm, but also has a good feeling of touch.