Men's down trousers are well sewn. The down trousers at the beam mouth can ensure the internal temperature and prevent the influx of cold air. Flat down trousers are easy for cold air to pour in. Feather pants are pants filled with down (down content is not less than 50%), which are mainly composed of down and feathers. After washing, drying and grading, down trousers are made, which are warm clothes in winter.