Grey eiderdown and white eiderdown are two common eiderdown fillers, which have their own characteristics in color, price and quality. White duck down mainly comes from Beijing white duck down, which is long in length, hard in texture, elastic, rough to the touch and high in price, and is often used as down jacket filler for light-colored fabrics. Grey duck down, on the other hand, is more suitable for down jackets with dark fabrics, which are generally from Beijing blue-headed ducks or platypus. Feathers are small, yellowish, cheap, large in size and moderate in price. Under the same quality, the yield of white duck down is small, so the price is high. The warmth retention of grey duck down and white duck down is similar, mainly depending on the color matching and overall aesthetics when purchasing. Pay attention to the cashmere content and resilience when buying down jackets. It is recommended to choose a down jacket with a cashmere content of more than 70% and a good fluffy and soft feeling.