Hand wash or use the laundry bag (included) for machine wash【Keep Your Body Toasty】Built in with quality carbon fiber heat elements and 3 heating levels (131°F, 122°F & 113°F) to generate consistent heat for 6 core body parts, including your neck, back, abdomen, and waist, helping to maintain body warmth, promote blood circulation, and relieve pain as well as tension in muscles.【USB-Powered for Lasting Heat】Uniquely powered by a portable charger with 2A or 2.4A USB output to keep warmth in and stand up against elements. Plugged into a 10000