Features 1. **Long-Lasting Heat**: Each hand warmer provides consistent warmth for up to 10 hours, ensuring your hands and body stay cozy during cold weather or outdoor activities. 2. **Easy to Use**: Simply open the package, remove the patch, and stick it to the inside of your clothing. Heat activation occurs within 15-30 minutes for immediate comfort. 3. **Portable & Convenient**: Lightweight and compact, our 10-pack of self-heating warmers is perfect for travel, outdoor adventures, or keeping in your car for emergencies. 4. **Versatile Relief**: Ideal for warming hands, feet, and relieving local pain, these patches are perfect for sports, camping, or simply staying warm at home. 5. **Safe & Natural Ingredients**: Made with iron powder, salt, and activated carbon, our hand warmers use a safe chemical reaction to generate heat without any harmful substances. Our hand warmer (10 packs) 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.