Not certified for medical use. Outer 100% polyester mesh with water-repellent finish. Mid-layer breathable foam 100% polyurethane. Inner-layer 80% polyester/20% elastane, scuba fabric with temperature controlled HeiQ & cool antimicrobial finish. Treated with a biocide: Silver chloride. Inner wire around nose bridge. Adjustable loops to ear. Washable carry pouch included. Non-returnable. DISCLAIMER: The TriDri® mask is a non-medical and non-PPE mask designed to help against the spread of airborne germs. This mask does not claim to prevent transmission of infectious diseases and viruses and should not be used where infection level is high for instance in a medical or clinical setting. Do not expose the mask to high levels of heat or combustible substances. We recommend you wash the mask before first use. Remove and do not use mask if you are suffering breathing difficulties or skin irritation. Non-returnable.