Cozy Feet are a polyester insert with super-thin embedded brass coils connected by flexible wires to two regular AA batteries. The batteries fit in a small pouch and attach to your ankle or calf with a Velcro strap. One size fits all, any shoe or boot (even waterproof ones). - SAFE - Shock-proof and low voltage: 3 V, 2 W
- IMMEDIATE RELIEF - In just seconds to a maximum 98° F (37° C)
- PORTABLE - Only 4.5" long x 2.875" wide x 0.25" thick. Inserts will go anywhere and are unnoticeable in any shoe, boot, or slipper. Move as much as you'd like - you're not tied to an electrical outlet.
- LONG LASTING - Powered by battery - won't lose its effectiveness like microwavable or reactive-chemical heating elements.
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