HotHands Stick-On Body Warmers allow you to stay warm and conquer any chill, the ultimate solution for the cold! Perfect for outdoor enthusiasts and winter warriors, the Stick-On Body 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 127°F (53°C) for a duration up to 9 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 peel away backing from warmer. Immediately place adhesive side on inside of outerwear or outside of clothing (NO CONTACT TO OR ON SKIN). Warmer heats up in 15-30 minutes. 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.