The surface layer is 50g spunbond fabric, the second layer is 45g hot air cotton, the third layer is 30g KN95 filter material, and the inner layer is 30g PP spunbond fabric.
The surface layer is 155g needle-punched cotton, the second layer is 30g KN95 filter material, and the third layer is 50g PP spunbond.
The surface layer is 50g spunbond fabric, the second layer is 40g hot air cotton, the third layer is 30g KN95 filter material, and the inner layer is 30g spunbond fabric.
The surface layer is 40s gauze, the second layer is 23g KN95 filter material, the third layer is 20g hot air cotton, and the fourth layer is 60g hot air cotton; folded a total of eight layers.
The surface layer is 32s gauze, the second layer is 20g KN95 filter material, and the inner layer is 90g needle-punched cotton (dot plastic); a total of six layers are folded.
The surface layer is 32s gauze, the second layer is 23g KN95 filter material, the third layer is 20g hot air cotton, and the fourth layer is 60g hot air cotton; folded a total of eight layers.