Nanjing Tongrentang Herbal Foot Warmers (6 patches/box) blend 300+ years of TCM wisdom with modern convenience. These self-heating pads use 7 medicinal herbs (including mugwort) to deliver 8 hours of gentle heat (40-50°C), stimulating key acupoints (Sanyinjiao/Yongquan) to relieve cold feet, fatigue, and dampness. Perfect for women's menstrual comfort, office workers, and winter nights. The no-mess, stick-on design provides "hug-like warmth" without electricity or odors. From China's historic herbal brand (since 1669), it's a safe, natural alternative to chemical warmers.