• KEEP YOUR BODY AND HANDS WARM: Qualified carbon fiber heating elements with 3 heat levels (approximately 65C, 55C & 45C) to generate even heat for 4 key body parts, including neck, back, stomach and waist, which helps maintain body heat, promote blood circulation and relieve muscle pain and tension. • STYLISH & CUSTOM DESIGN: Lightly insulated to allow you to wear it in many ways with unrestricted movement; Water and wind resistant. The tight fit is perfect to wear under your winter jacket. • LONG-LASTING USE: A 10000mAh power bank offers up to 8 to 10 hours of heat on average (duration may vary depending on different types of power bank); Power bank is NOT included in our product. • OVERHEATING PROTECTION: Built-in sensor will trigger to immediately stop heating if the internal temperature of the heating area exceeds 65C for any reason. Guarantees your safety at all times. • LYT team is your ever loyal partner. We treat every customer with sincerity and solve all problems with professionalism. Our after-sales team is always ready to guarantee your shopping experience.