Just like the rest of Carhartt's line of clothing, Carhartt sweatshirts are made to provide maximum comfort and durability that Carhartt is known for. Each Carhartt sweatshirt is made of high quality 100% cotton or cotton blends. Carhartt sweatshirts are the perfect choice for wearing alone or layering. When you wear Carhartt sweatshirts, you're wearing a legend. Carhartt. Work Sweatshirts for the American worker.