1. Sweater pants refer to those pants with fluffy fabrics under them. Usually worn in autumn and winter. Sweaters can be made into sweatpants or other styles of leggings. The sweatpants can be made of that kind of material or polyester, the former is worn in winter and the latter in summer.

2, windproof pants can only be worn as a single windproof, such as riding a bike or motorcycle in cold weather, to resist the cold wind.