Features: 1. **Long-Lasting Warmth**: Each heat patch provides up to 10 hours of continuous warmth, perfect for keeping your hands, body, and feet cozy throughout the day. 2. **Easy to Use**: Simply open the package, peel off the patch, and stick it inside your clothing. It starts heating within 15-30 minutes, making it hassle-free for anyone. 3. **Safe and Comfortable**: Made with sodium chloride and vermiculite, our hand warmers are safe for all ages, including babies, ensuring a gentle and comfortable heat experience. 4. **Portable and Convenient**: With 40 patches in a set, you can easily carry them in your bag or pocket, making them ideal for outdoor activities, travel, or everyday use. 5. **Versatile Application**: Perfect for various situations such as cold weather, sports events, camping, or simply relaxing at home, our hand warmers are a must-have for anyone seeking warmth. Our hand warmer contains sodium chloride and vermiculite. It can keep you warm all day. Its use method is very simple: 1. After opening the package, take out the patch and stick it on the inside of the clothes. 2. The patch will start to heat up in 15-30 minutes. 3. The insulation effect can last for 10 hours. And can last super continuous heating, 10 hours of heat, warm your hands, body and feet.