Sweatshirt, also called a jumper, typically with long sleeves, made of knitted material. When sleeveless, the garment is often called a Pullover or sweater vest. Sweatshirt are worn by adults and children of all genders, often over a shirt, T-shirt, or other top, but sometimes next to the skin. Fleece jacket is a lightweight casual jacket made of a polyester synthetic wool such as polar fleece.