N99CV Vogmasks contain a microfiber inner and outer layer, N99 particle filtering media, carbon filter, and one exhalation valve for facilitating exit of moisture and CO2 from the interior of the mask. Trim and ear loops are made with latex-free spandex. Vogmask carries the following international respiratory compliance certifications for reusable personal protective equipment: CE Mark Personal Protective Equipment - filtering half masks for particles, against EN 149:2001 + A1:2009. CE Certified FFP1 R Personal Protective Equipment (PPE) Directive 89/686/EEC KF-94 Korean Ministry of Food and Drug Safety, Seoul, Korea KN-94 KN95 China Personal Protective Equipment Conforms to NIOSH N99 filter efficiency as stated in 42 CFR Part 84.181 GB2626-2006 Personal Protective Equipment Certified KN95