Features:1. **Quick Heating Action**: Our self-heating patches activate within 15 to 30 minutes, providing immediate warmth to keep you comfortable in cold conditions.2. **Long-lasting Warmth**: Enjoy up to 10 hours of continuous heat, perfect for long outings or chilly nights, ensuring you stay cozy all day long.3. **Easy to Use**: Simply open the package, peel off the backing, and stick the patch to your clothing or fabric for instant warmth without any hassle.4. **Portable and Convenient**: Each box contains 10 patches, making it easy to carry and use whenever you need extra warmth, whether at home or on the go.5. **Versatile Application**: Ideal for the waist and abdomen, these patches are perfect for relieving discomfort during cold weather, sports, or outdoor activities.Our heat patch (box set) contains iron powder, vermiculite and activated carbon. It can heat up quickly, making you feel warm for a short time in the cold winter. Its usage method is very simple: 1. After opening the package, take out the patch and stick it on the inner side of the clothes. You can also stick it on the fabric and wear it on your hand to warm it up. The patch will start up within 15 to 30 minutes. The heat preservation effect can last for 10 hours. Quick start to keep you comfortable in cold weather. Continuous heating for up to 10 hours, all-weather heat preservation, stable and reliable.