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They have become so popular that San Francisco hosted its first Snuggie Pub Crawl Friday night.
Organizers called it "BYOS" which stands for "Bring Your Own Snuggie."
To be part of the event attendees had to wear a Snuggie, a hot-selling type of blanket with sleeves.
No regular blankets were allowed. But, people could make their own alterations and compete for best male and female snuggler.
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