HotHands Hand Warmers allow you to stay warm and conquer any chill the ultimate solution for cold hands! Perfect for outdoor enthusiasts and winter warriors these compact and portable hand warmers provide long-lasting heat to keep your hands 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 135°F (57°C) for a duration up to 10 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 open the package and place them in your gloves or pockets. Each warmer pouch is approximately 2” x 3.5” and warmers are packaged as pairs. 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.