White duck down is usually used to fill clothes with light-colored fabrics because it is light and clean. Gray duck down is mostly used to fill down jackets with light-colored fabrics.
In terms of price, white duck down is more expensive than grey duck down. This is mainly because the manufacturers of down jackets are in the south, while there are more grey ducks and black ducks produced in the south, and there are relatively few white ducks, so the price is higher.
Generally speaking, white or light-colored down jacket liners are mostly white duck down to avoid affecting design details and exquisite quality. For safety reasons, gray duck down will be used for dark down jackets.
High-quality down jackets generally have two or three layers of fabric to prevent the phenomenon of down drilling, so it is difficult to see the color of down inside. Nevertheless, people have a high degree of affection for white duck down, so they are more willing to accept white duck down filled with down.