<li><b>Shell :</b>100% Polyester<br> <li><b>ONE SIZE :</b>4.3 " * 7 "<br> <li><b>FILTER :</b>Activated Carbon Filter ( 5 Layers )<br><br> <li>Suit for all kinds of outdoors and indoors activities, such as running, jogging, cycling, camping, hiking, backpacking and daily use.<br><br> <li><b>NOTE :</b><br> <li>This mask is not intended for medical use, and not proven to reduce the transmission of disease.