Far infrared functional polyester fiber and yarn 1. Fiber Specification: 1.5d *38mm, can be used to make blend yarns with cotton, viscose or other fibers. 2. filament spec.: 75D, 150D 3. 7.5D hollow fiber, to be used as filling fiber for bedding, sleeping bag, etc. Far infrared ray emission rate: 0.87 (wavelength 4-16um, testing standard CAS115-2005) Other health care effects: Generating negative ions Anti bacteria