Back Neck Heat Patch: 100% pure natural herbal extract; Self-heating helps relieve pain and reduce joint stiffness; Lightweight, breathable and specially designed for knees, not easy to fall off. WELL KNEE PATTERN :Wormwood pain relief patch can quickly relieve various knee joint pain; keep warm, activate blood circulation and relieve pain. More than 12 hours of analgesia that provides continuous warmth and comfort. NO SIDE EFFECTS Designed with self-heating pain relief patch, safe, non-irritating. Slim, comfortable, ergonomic design ensures a secure fit; medical grade adhesive is softer on the skin. Easy to use: simply clean the affected skin with warm water, peel off the protective film and stick the self-adhesive film on the injured area. It is recommended to apply the patch 5 times a week for 6-8 hours each. You can cut the patch to any size that fits the painful area. MULTIPURPOSE PAIN PATCHES Our pain relief patches can relieve various pain, knee pain, joint pain, back pain, arthrosis knee, sprains, shoulder pain and neck pain. Suitable for drivers, office workers, athletes and the elderly.