Features 1. **Long-lasting Heat**: Enjoy up to 10 hours of continuous warmth with our portable hand warmer, perfect for keeping your hands, body, and feet cozy during cold weather. 2. **Easy to Use**: Simply open the package, remove the patch, and stick it to the inside of your clothing. Heat activation starts in just 15-30 minutes for instant comfort. 3. **Safe and Effective**: Made with natural ingredients like iron powder, salt, and activated carbon, our self-heating patches provide a safe and effective way to relieve local pain and discomfort. 4. **Versatile Application**: Ideal for outdoor activities, sports, or simply staying warm at home, our hand warmer is perfect for anyone needing extra warmth in chilly conditions. 5. **Compact and Portable**: Lightweight and easy to carry, our hand warmer patches are perfect for travel, ensuring you can stay warm wherever you go. Our hand warmer (single pack) contains iron powder, salt and activated carbon. It can release heat through chemical reactions, raise body temperature, warm hands and relieve local pain. Its usage method is very simple: After opening the package, take out the patch and stick it on the inner side of the clothes. The patch will start heating within 15 to 30 minutes and the heat preservation effect can last for 10 hours. The high temperature that can last for 10 hours warms your hands, body and feet.