Multi-walled-carbon-nanotube (MWCNT)-coated polyester thread that is highly conductive, lightweight, and fatigue resistant. Electrical resistance of the yarn remains even throughout its entire length, and can be customized from 1 to 1010 Ohm/cm. Bending, stretching, and contracting have little effect on electrical resistance. These yarns offer much higher resistance to bend fatigue and lower density when compared to metallic yarns or cables. When used in heating applications, the speed of heating is up to 30%–60% faster than metal wire heaters. The CNT are dispersed in a liquid and then coated on individual polyester filaments using a highly viscous binder through a specialized dyeing process. Each filament is then twisted together to create a multifilament yarn. The stock format is a 48-strand polyester thread with a 240 dtex and 900 Ohm/cm resistivity. These conductive yarns are only available in black. They are typically incorporated into woven fabrics. Fabric thickness and thread yarn count can be fully customized. Almost any natural or synthetic fibers could be CNT coated in a similar fashion, including nylon, aramid, glass fiber, cotton, wool, silk, and others; however, currently only polyester is available and the electrical and physical properties of the different yarn types would vary from fiber to fiber. Heating fabrics have been tested to survive hundreds of wash cycles. Current applications include heating or de-icing systems for the transportation industry and apparel heating for the consumer and medical markets.