Oprah Daily editors love that the warmers charge in 3 to 4 hours and stay warm for up to 15 hours. Plus, it doubles as a phone charger on the go!

If you're braving the cold this January, you're probably looking for options to keep warm, from choosing toasty winter workout gear to finding the best setting for your thermostat. Thankfully, one ...

To make a safe, portable form of heating to take to the rest of the team working up on the glacier. All combustion reactions (such as the burning of coal) are exothermic. Incredibly, the reaction ...