HK99 3DMASK (30 pieces)Size：~24 x 12.5 cm 30pcs individually packaged/box4-layer HK99 three-dimensional maskOuter layer: SS non-woven fabricFilter layer 1: BFE and PFE ≥99% melt blown clothFilter layer 2: BFE and PFE≥99% melt blown clothInner layer: SSS skin-friendly clothFeaturesThree-dimensional tailoring of highly breathable masks, comfortable and will not burn the skin4-layer filtration, effectively filtering 99% harmful particles, pollen, dropletsComfortable surrounding chin design expands large breathing space and greatly improves breathability