Sprinters and other track athletes may prefer to wear shorts instead of track trousers in hot weather. The first sweat suit was a two-piece outerwear outfit meant to protect sportsmen participating in sports such as track and field. Many current types of tracksuits, sometimes known as tracksuits, are made from technologically superior textile materials. They are more resistant to heat than modern athletic gear, so they can be worn for longer during exercise sessions or games. The men's short is a type of leg garment that falls below the knee but does not cover the foot. Short pants have been used by men for various reasons throughout history. In some cultures, including many in Asia, it is considered improper for males under certain ages or circumstances to show skin. In other cultures, such as parts of Africa, it is customary for males of fighting age to wear shorts. Modern shorts are designed to be tight fitting, but not so tight as to be uncomfortable or restrict movement. Some men may choose to wear shorts because they are considered fashionable or desirable by others. This often has nothing to do with their sport; people wear jeans even when playing tennis or golf. Sportswriters may refer to all competitively dressed athletes as "shorts" regardless of gender or length. Short tracks are races on dirt or grass where the distance is typically between 400 and 600 meters (437 and 914 feet).