Soft fleece sheep-shaped muffler. - Design: Sheep-shaped muffler - Material: Soft fleece - Features: Dotted fabric on the inside Thank you for viewing. There are black spots on the heat pack. I just found the instructions and tried clicking the metal button inside the heat pack for the first time. To reuse it, it seems you need to put it in hot water for 10 minutes. I feel like using regular disposable heat packs would be less troublesome. After purchasing, I only cut out and kept the instructions, and now I tried to see if the included heat pack works. It seems better for warming the shoulders and stomach than as a muffler. It's too short for adults as a muffler.