Down content of a few percent is used to measure the purity of the filling, generally 90% is a good velvet, at least 70-80%, less than 70% of the impurities are more difficult to wear the warmth is poor. How thick should see RongLiang, abandon RongLiang grams, the more the more thick. Short, about 200 grams is considered thick. There is no big difference between white duck down and grey duck down in terms of warmth, generally white duck down is used to fill light fabric clothes, grey duck down is used to fill dark clothes, white duck down is more expensive than grey duck down.
Down content of a few percent is used to measure the purity of the filling, generally 90% is a good velvet, at least 70-80%, less than 70% of the impurities are more difficult to wear up the warmth is poor.