Abstract: A sleeping bag includes a sleeping bag body configured to envelope a person lying within the sleeping bag body, and a section of thermal fleece material attached to the inside surface of the sleeping bag body at a designated area, configured to provide additional warmth to a sleeping bag user at the designated area. In one aspect of the invention, the designated area includes a foot area. In another aspect of the invention, the thermal fleece material is soft to touch. In another aspect of the invention, the sleeping bag body is configured to couple to another sleeping bag body to form a larger sleeping bag. Advantages of the invention include the ability to provide added thermal insulation to a sleeping bag, as well as added comfort to a sleeping bag user, at a designated area of the sleeping bag.