OwlHeat [Hand Warmer - 20 Pack / 40 Pieces] Disposable Self Heating Hand Warmers - Up to 160 hours of total warmth! - Just open and they heat up in seconds&hellip; Long-lasting Heat: Each hand warmer provides up to 8 hours of warmth Quick & Easy to Use: Just open, shake, and the warmer heats up in seconds! Even children can activate this warmer easily. Place warmer into your pockets, gloves, mittens, or other desired locations to keep warm for HOURS! Natural Heat: This item is designed with safety in mind! It is created with odorless non-toxic natural ingredients. Great tool for emergencies, cold outdoor activities, winter sports, snowy and rainy days, traveling, and for students/children/elderly.