A T-shirt or tee-shirt is a fabric shirt named after the T-shape of its body and sleeves. Traditionally, it has short sleeves and a round neckline - known as a crew neck - which lacks a collar. T-shirts are generally made of a stretchy, light, and inexpensive fabric and are easy to clean. They’re especially popular with branding for companies or merchandise, as they’re inexpensive to make and purchase.