A comfortable black T-shirt typically features a soft, breathable fabric like cotton or a cotton blend, providing a relaxed fit that allows for easy movement. The shirt often has a classic crew neckline, which adds to its casual appeal, and short sleeves that keep it cool and versatile for layering. 
The seams are usually well-constructed to prevent irritation, and the fabric might have a slight stretch for added comfort. This T-shirt can be worn on its own or paired with jeans, shorts, or even under a jacket for a stylish, laid-back look. Its solid black color makes it easy to accessorize and suitable for various occasions, from casual outings to lounging at home.