Safe Material: Made of non-woven material, our foot warmer is safe and comfortable, providing you with warmth in the winter.Everyday Necessities: Single-use air-activated warm heat packs that are ideal for keeping your body hand toe feet warm when the temperature gets cold to provide everyday warmth.Long-lasting Heat: With long-lasting warmth up to 10 hours of heat lasting. It will continuously keep your feet warm and comfortable.Easy to Store: This hand warmer is easy to stow and store in a backpack, suitcase or jacket pocket.Wide Applications: Perfect for outdoor sports events, fishing, camping and hiking, working in the yard, jogging or walking with pets. Convenient, compact and portable.Notes:  Due to the lighting effects and shooting angles, the color of the item and that shown in the picture might have a nuance.Due to manual measurement, there might be a tolerance in the product size.Specifications: Product size: about 10*13cm/3.94*5.12in Product material: non-woven fabricProduct specifications: 10 piecesHeating temperature: average 55°Heating time: 18 hoursPacking List:Hand Warmer*1 Box (10pcs)