Mask approved and certified by UNE 0065:2020 and CWA 17553. They can be washed up to 45 times without losing their characteristics or effectiveness. 96% aerosol filtration efficiency. 94% particle filtration efficiency. 270gr. Composition: 92% polyester, 8% elastane Karactermania collaborates with cáricas by donating a percentage from the sale of these masks to help alleviate the effects of the Coronavirus crisis among the most disadvantaged groups in society.