Hot therapy packs feel like a warm hug. Based on our customer feedback and market research, the unique design of our Thera Pac conforms easily around the neck, upper shoulders, and upper back. It is lower in the back with channeled construction to keep the natural grains and spices evenly distributed over your muscles. We constructed this pack with fleece on one side and cotton/flannel fabric on the other side to provide effective hot and cold therapy. 16.5" x 12" Scented or unscented.