Real duvets are made of duck down and a few softened feather pieces. If the quilt has no peculiar smell, the quilt fabric is resistant to cashmere escape, fluffy and warm, and there is no dust overflow, such a quilt is definitely not 100 yuan. The reference price of real duvets is around 800 yuan, and its value can be judged according to the difference of down content and punching amount, whether the filler is duck down or goose down, as well as the washing process and quilt fabric.