No, fleece is not made of cotton. Fleece is a synthetic material that is made from polyester, which is a type of plastic.
The fibers are brushed and sheared to create a soft, fluffy texture. The material is warm, lightweight, and quick-drying, making it a popular choice for outdoor and athletic wear, as well as blankets and bedding.
Cotton, on the other hand, is a natural fiber from the cotton plant. It is soft, breathable, and hypoallergenic, but it can be heavier and takes longer to dry than fleece.