... /1,Ne40/2Composition::100%bamboo charcoal fiber,or bamboo charcoal / cotton 20%/80%,50%/50%,40%/60%Bamboo charcoal yarns with innumerable holes ... , with 500W halogen light shone on the bamboo charcoal yarn for 10 minutes, the yarn emits far infrared rays for 87% ~ 92 ... natural no irradiation, the best choice of warm textiles.Bamboo charcoal fiber yarns are widely used in mattresses, pillows, mattress ...