Nanjing Tongrentang Herbal Knee Patches (3 patches/box) use a 300-year-old TCM formula with 6 potent herbs (mugwort, ginger, etc.) to deliver deep-penetrating steam therapy (40-50°C for 8 hours). Unlike surface-heating pads, our herbal steam reaches joints to relieve stiffness, coldness, and discomfort. The self-adhesive design stays secure during movement, making it ideal for arthritis sufferers, athletes, and anyone with knee stress. 100% natural, drug-free, and backed by China’s trusted herbal brand (since 1669).