ActionHeat Black Polyester/Wool Blend Heated Socks (Large) in the Heated Clothing department at Lowes.com
I present, the best battery holder I've ever come across. An 18650 fits almost snug, but any size battery will also fit perfectly. Payed 2 bucks for it at a CVS store. :
Microbattery Blog - Battery News, Technology, Tips & Tricks
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Batteries - CVS Pharmacy
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