FullLight Tech Bluetooth Beanie

If you're going to be out in the cold, a headphone beanie is ideal. This one from FullLight Tech has a subtle appearance and a reasonable price.
Pros and Cons
Pros
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Comparatively affordable
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Subtle appearance
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Safe for staying aware of surroundings
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Keeps you warm
Cons
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Too small for some users
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Iffy audio quality
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Not comfortable for extended use