1. Selected quality fabric and silk filling, smooth runner lock, precisely cut and perfectly sewn collar, skin-friendly, close-fitting, comfortable and beautiful.2. Built-in far-infrared heating module, intelligent heating, one-button control, fast heating in 3s, without wasting too much time waiting.3. Waterproofing process design, easy to wash by water, suitable for both machine wash and hand wash, high safety.4. 5 heating zones design, humanized divisions of heating zones for the parts of the abdomen, waist and back that are most susceptible to cold, keeping the body warm, helping to promote blood circulation and relieve muscle stiffness.5. Technology temperature control design, full-range temperature control, intelligent heating, dual heating, with high heating efficiency.6. 3-level heating design, intelligent temperature control at 35°C energy saving, 45°C comfortable and 55°C warm.7. 5V working voltage, long battery life, taking 10,000mAh rechargeable battery not included as an example, supports 3H - 5H warm level, 5H - 7H comfortable level, 6H - 8H low temperature level, continuous heating.8. Thoughtful pocket design, intimate items to carry with ease.9. Unisex and 6 sizes design, wide application, reliable for skiing, running, cycling, mountaineering, hiking and other outdoor activities.