AEKI SMART HEPA MASK A mask that allows our child to breathe comfortably. -MASK High-Efficiency Particulate Air(HEPA) is widely used in medical equipment. It can filter 0.3 micrometre particles. The effective filtration effect DOP is more than 99.5%. -Three stage fan and carbon dioxide exhaust port make it no longer difficult for children to breathe of the dense fabric layer of high anti eqidemic mask. -Silicone elastic band, will not fall of no matter running, jumping and dumping