4-layer HK99 three-dimensional mask Outer layer: SS non-woven fabric Filter layer 1: BFE and PFE ?99% melt blown cloth Filter layer 2: BFE and PFE?99% melt blown cloth Inner layer: SSS skin-friendly cloth Features Three-dimensional tailoring of highly breathable masks, comfortable and will not burn the skin 4-layer filtration, effectively filtering 99% harmful particles, pollen, droplets Comfortable surrounding chin design expands large breathing space and greatly improves breathability Precautions: ?This product is a disposable product, please do not wash it. Please dispose of the mask properly after use. Please put the product in a cool and dry place, avoid direct sunlight. Please avoid placing it in the reach of children, and store it in a clean place. "HK99 3DMASK (30 pieces) Size?~24 x 12.5 cm 30pcs individually packaged/box"