HotHands Hand Warmers

These technically aren't gloves, but they're a great way to keep your hands warm when cold weather hits. Be careful to avoid direct skin contact.
Pros and Cons
Pros
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Long-lasting heat
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Consistent temperature
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Low chance of user error or burns
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Convenient with existing winter wear
Cons
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Single use is not eco-friendly
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Non-reusable quality makes them costly over time