Made from cotton, each mask fits comfortably with adjustable elastic straps and now come in two sizes. These masks are tested to a KN90 standard and filter at least 90% of airborne particles down to pm2.5. They’re able to filter particles including general pathogens and air pollution. 100% of proceeds go towards empowering youth through quality education and access to healthcare. You’re doing so good. You’re changing lives with every Cotton On Foundation purchase. *As with all health decisions, please consult with your medical professional to determine compatibility with your personal situation if you are seeking a face covering to wear in relation to medical issues. We make no medical claim in regard to the usage of this mask.