Features: Intelligent temperature control, heated with knees, back and waist. Powered by any 5V / 2A USB portable charger, the USB plug is compatible with most portable chargers on the market. Which can start heating in 30 seconds, long duration and long heating time. 3-level adjustable temperature with indicator light to adjust the required temperature. Safety insulation design, built-in thermal protection module, 5V safety voltage, once overheated, it will stop running until the heat returns to the standard temperature. Support manual/machine washing.The safety protection function ensures that the machine is not damaged during washing. Heating underwear helps to improve blood circulation, enhance metabolism, which is very suitable for people who are afraid of cold, Raynaud's disease, arthritis, poor blood circulation, and stiff joints. The best solution for various outdoor activities, such as skiing, fishing, jogging, Hunting, biking, hiking motorcycles, protecting climbing dogs, Running, snow removal, etc. Specifications: Name: Heated Thermal Underwear Color: Black Gender: Men Material: 95% Cotton and 5% Spandex, Carbon fiber wire Heating temperature: Red LED 50℃, Bule LED 40℃, Green LED 30℃ Power supply: USB power bank (not include, 10000mah power bank can be heated for about 6-7 hours) Size: M, L, XL, 2XL Season: Autumn, winter Package includes: 1 x Heated Thermal Underwear Tops 1 x Heated Thermal Underwear Pants (Note: Not included power bank)   1. Warmth: Thermal leggings are designed to provide an extra layer of insulation, keeping your legs warm and cozy in cold weather conditions. 2. Comfort: Thermal leggings are often made from soft and breathable fabrics that provide a comfortable and snug fit. They allow for easy movement and flexibility throughout the day. 3. Versatility: Thermal leggings can be worn as a base layer under clothing for added warmth during outdoor activities like hiking, skiing, or camping. They can also be worn on their own as stylish and comfortable leggings for everyday wear. 4. Moisture-wicking: Many thermal leggings are made with moisture-wicking properties, which help to draw sweat away from the body, keeping you dry and comfortable during physical activities. 5. Layering: Thermal leggings are great for layering, allowing you to easily add warmth to any outfit. They can be worn under dresses, skirts, or even jeans for extra insulation without adding bulk. 6. Fashionable: Thermal leggings come in a variety of styles, colors, and patterns, making them a fashionable choice for both casual and athletic wear. You can find options that suit your personal style and preferences. 7. Durability: Thermal leggings are often made with high-quality materials that are designed to withstand regular wear and tear. They are built to last, providing you with long-lasting warmth and comfort.