Middle layer: 3M thinsulate insulating Fabric foam
Inside layer: Polyester with copper yarn fabric
Available Sizes:XS - Suitable for infants/S - Suitable for kids/M - Suitable for women/L - Suitable for men
- Filtering effect (0.075μm): 75%
- PM2.5 Protection: Good
- Air Permeability: Good ASTM D77-96
- Dust proof: Yes