The easiest answer to what is fleece is that it is a synthetic material that looks and feels like a fur coat on sheep. It is extremely versatile, comes in a lot of color options, and can be paired with almost anything. With fleece tops and inner layer options like fleece shirts, fleece pullovers, fleece hoodies, and fleece knitted sweaters, your winter will be colorful, stylish, and warm. http://www.gs-fleece.com/fleece-top/