Feather liner is lighter than polar fleece liner in thermal insulation performance, and has higher thermal insulation index, which provides better thermal insulation effect in cold weather conditions. The down liner also has the characteristics of lightness, softness, comfort and breathability, which can make people feel more comfortable to wear. Polar fleece lining is more suitable as the inner filler of coat or overcoat. Polar fleece lining is heavier than down lining, and its thermal insulation performance is poor. To keep warm in cold weather and be comfortable to wear, down liner is a better choice.