Advanced Heating Technology:Experience warmth with 6 carbon fiber heating elements strategically placed in the shoulders, back, waist, abdomen, and knees. Achieve a balanced and wider heating area that promotes blood circulation, enhances metabolism, and reduces muscle stiffness. Keep your body activated and comfortably warm. Premium Fabric for Comfort:Our heated thermal underwear is crafted from soft and breathable fabric, providing all-day comfort and warmth. The material is gentle on the skin and emits zero radiation. Ideal for the fall-winter season, it can be easily cleaned by hand or machine without affecting the internal heating system. Comfortable Design and Durability:Enjoy premium comfort and durability with our thermal underwear. The soft and breathable polyester fabric ensures effective warm protection, while comfortable liners and robust elastic reinforcement contribute to a superior experience. The underwear starts heating within 30 seconds and offers three temperature settings (low, medium, and high) with a duration ranging from 2 to 5 hours. Versatile Usage:Perfect for various outdoor activities and work in cold environments, such as jogging, dog-walking, outdoor work, diving, hunting, skiing, fishing, hiking, biking, motorcycle riding, cold storage work, and snow shoveling. Whether you're concerned about the winter chill or live in cold regions, this thermal underwear set is an excellent choice. Note: The package does not include batteries.