HotHands Toe Warmers allow you to stay warm and conquer any chill, the ultimate solution for the cold! Perfect for outdoor enthusiasts and winter warriors, the Toe 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 122°F (50°C) for a duration up to 8 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 outer package just prior to use. Only use on bottom of sock for maximum warmth, and use in ventilated or loose-fitting footwear. 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.