Sleeveless shirts are garments that lack sleeves, allowing for greater freedom of movement and ventilation. They come in various styles, including tank tops, halter tops, and muscle shirts, making them suitable for different occasions, from casual outings to athletic activities. These shirts are often made from lightweight materials like cotton or polyester, making them ideal for warm weather. Sleeveless shirts can be worn by people of all ages and genders, and they are popular in many fashion trends, especially during summer months or in fitness settings.