Check the listing for details. Cambridge Mask The Admiral PRO small medium large SEALED Expires June 2025. Color: Blue, Condition: New. Listed at 180.00 USD. Family set of 5 masks: 2 small, 2 mediums, 1 large Cambridge Mask The Admiral PRO small medium large SEALED Expires June 2025. Condition is "New". Shipped usps Cambridge Masks are respirators (PPE) with UK military grade filtration technology. The masks filter out dust and pollution particles such as PM10, PM2.5 and PM0.3 as well as bacteria and viruses using a unique triple layer filtration system. The first layer catches larger pollution particles such as dust and PM10, followed by the Three-Ply Micro Particulate Filter which stops nearly 100% of smaller particulate matter such as PM2.5 and PM0.3. The final layer has been developed by the UKs Ministry of Defence and filters out viruses, bacteria and gas pollution such as Volatile Organic Compounds (VOCs), Ozone, Benzathine and Formaldehyde. We call this The British Pollution Solution.