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Sweatpants are a casual variety of soft trousers intended for comfort or athletic purposes. In Britain, Australia and New Zealand they are known as jogging bottoms or trackpants.

Sweatpants are usually made from cotton, and the chief characteristic distinguishing them from other athletic pants is the elastic band located around the waist. Also, many sweatpants do not have pockets. Sweatpants are traditionally ash gray in color but are now available in essentially any color. They are usually quite "baggy" and loose, which makes them easy to slip into (and out of) and allows a great deal of flexibility and comfort. In addition, this design traps less heat than most conventional, lightweight trousers, which may be a disadvantage in some contexts (such as cold temperatures) and an advantage in others (such as body heat-increasing aerobic activities). The sweatpant variations listed below are made from different materials.

There are many variations on the sweatpant design that have evolved to define their own categories of athletic pants. These variations include fashion pants, windpants, tearaway pants, and muscle pants.