Nano Fibre Layer : Innovative High Density Nano Fibre Layer is used in middle which gives high breathability and filters additions dust and pollensUltrasonic Sealing on all 4 sides: Durable Ultrasonic Sealing to block virus penetration from any sideHydrophilic Inner most Layer : The innermost layer is Hydrophilic which makes it sweat absorbent and Skin friendlyDurable Soft Fabric Ear Loops: Extra 5mm width of loops which provides extra stretch making it comfortable for people with broad faceFabric type: Non Woven Fabric