Warm up to the idea of working outdoors in the cold
Battery-operated, polyester Cozy-Feet shoe inserts are embedded with brass coils connected to AA batteries (2 per foot) via flexible wires. Batteries fit in small pouch that attaches to ankle or calf with Velcro strap. Shock-proof, low-voltage inserts heat up in secs. to maximum temperature of 98 F. Will not lose effectiveness like microwavable or reactive-chemical models. One size fits all. Place in any shoe, boot, or even mitten. Ideal for outdoor workers.