HotHands Super Warmers allow you to stay warm and conquer any chill the ultimate solution for the cold! Perfect for outdoor enthusiasts and winter warriors the Body & Hand Super Warmers provide long-lasting heat to keep you toasty in any situation. The HotHands family of air-activated warmers all contain a mixture of natural ingredients that when exposed to air react together to produce heat. This is accomplished through an extremely fast oxidation process. Ingredients include: iron powder water salt activated charcoal and vermiculite. These HotHands warmers produce long-lasting steady heat with an average of 140°F (60°C) for a duration up to 18 hours. See product package for details. Whether you re hiking skiing hunting watching a game or simply braving the winter commute these odorless warmers are made of natural ingredients and are your go-to companion. Designed for ease of use simply remove warmer from the outer package. Warmer heats up in 15-30 minutes. If heat decreases expose warmer to air and shake. Don t let cold weather hinder your adventures. HotHands are TSA-approved and there is absolutely no problem with taking them aboard or using them during flight. They are completely safe for air travel.