Fleece jackets are a lightweight casual jacket made of a polyester synthetic wool. What does this mean? Warmth and coziness, while looking super stylish. Fleece jackets typically zip up halfway, instead of zipping the whole way down or having buttons. They come in a wide variety of colors and styles. Choose a casual color and pair it with a white tee and skinny jeans. Go for classic zip-up pullover and let the fabric keep you hot in the cold.