USB Electric Heated Underwear Shirt, 16 Heating Zone Thermal Base Layer Top for Men Outdoor Activities

silky and warm: This thermal underwear is made of 95% cotton and 5% spandex. The fabric has been upgraded to make it softer and more breathable. Double the thickness to make the garment warmer.16 heating zone design: Our thermal underwear top is designed with 16 carbon fiber heating elements, which can distribute heat to the mid-back, shoulders and abdomen, helping to improve blood circulation, reduce muscle stiffness, etc., and keep the body warm.Fast and long-lasting heat retention: Adjust the 3 available heat settings (30℃ to 55℃) with the touch of a button. You can adjust the temperature as needed. Powered by 5V battery; works up to 10 hours on a single charge; USB port for charging smartphones.Easy to operate: control heating with one button. After connecting the battery, click the button for 3 seconds to start heating, click to change the heating level. And press the button for 2 seconds to stop heating.Washing instructions: It is recommended to wash this long-sleeved thermal underwear below 40℃. After cutting off the power, add neutral detergent and wash by hand or machine. Do not dry clean, do not rub or beat hard, let it ventilate naturally. Perfect for everyday use. premium materials and excellent craftsmanship ensure long-lasting durability.