"My daughter plays travel soccer, and sitting on metal bleachers at 8:00 AM in 25-degree wind was torture. Disposable chemical packets always took twenty minutes to get lukewarm and died halfway through the second half. I keep one of these in each coat pocket on medium. My hands stay completely toasty for both games, and I still had battery left to top off my phone in the car."

"If you have Raynaud's or poor circulation, you know the dread of your toes going ghost-white and dead numb. This thing heats up literally the second you turn it on, bringing feeling and blood flow back to my feet faster than warm water. It stays right inside my winter boots and goes everywhere with me."

"Used these for three days skiing at Breckenridge. Anyone who skis knows freezing chairlifts will turn your feet completely numb in ten minutes. I slipped these into my ski boots and got instant relief, keeping my feet comfortable and warm all day long."

"The low-profile shape is so comfortable to wear in boots or shoes without feeling bulky or awkward. It provides consistent warmth that lasts through my 40-minute morning dog walks and beyond. I only need to recharge it about once a week."