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Reusable thanks to resealable bag: you determine the heat. Enjoy the heat for as long as you need it, then place the warmers back into the included resealable bag to interrupt the air-activated reaction and retain the remaining heat for later. UP TO 8 HOURS OF WARMTH PER PAIR Each pair provides up to 8 hours of warmth in total. This is ideal for use at short intervals over several days - ideal for everyday commuting, walking the dog or going to school. Quick and easy activation: simply open the pack and shake the warmer to activate it. It heats up in minutes and provides instant, hassle-free heat whenever you need it, without external power supply. COMPACT & POCKET SIZED These warmers are lightweight and portable and fit comfortably in your bags or gloves. They deliver targeted warmth without adding bulk. GENEROUS STOCK FOR 20 PAIRS - This pack contains 40 individual reusable warmers and 20 resealable storage bags, making it an excellent supply for families, frequent users or as a supply for the entire cold season.