Gerbing Microwire® technology is thinner, lighter, stronger and more durable than copper wiring. And it heats up in just 10% of the time! Gerbing Microwire® technology was developed in response to a Department of Defense contract for heated clothing to be used by Special Ops Forces. The wire consists of hundreds of microscopic stainless steel strands wrapped in a thin Teflon coating. These wires are flexible, yet exceptionally durable. This results in a rugged garment that heats instantly.