A sleeveless shirt, tank top or singlet (or sometimes vest) is a shirt manufacture without sleeves, or one where the sleeves have been cut off. Sleeveless shirts can be worn by either gender, depending on the style. These sleeveless undershirts do not prevent sweat stains from showing through. Tank tops are often worn by athletes in sports such as track and field and bicycling. Tank tops have been popular warm-weather casual wear in the United States since the 1980s, and are regarded as acceptable public casual dress in some locales. They are mostly preferred in hot climates since the arm holes provide ventilation and the thin fabric provides comfort.