The Lessing PRO boasts exclusive long-lasting filter technology designed by the British Ministry of Defence. Filtering out nearly 100% of all harmful air pollutants and viruses. Lightweight and breathable, this certified face respirator has a snug fit for maximum protection. Unique Lab tested British Military Filtration Technology filters almost 100% of pollution, gases, allergens, smog, and pollen Lightweight, breathable material Filters 99.6% of all viruses and 99.7% of bacteria Filters PM10, PM2.5, PM0.3 CE Certified UK Military Filtration Technology Lasts up to 340 hours of active use (3 – 6 months) Ideal for people at risk of respiratory diseases, living in or traveling to areas with high air pollution/smoke levels Adjustable ear loops with toggles for a secure snug fit Fit with a valve to help regulate Co2 build-up Presented in eco-friendly packaging for storage Head-straps and Nose-foam are included. Valve Deactivator is not included.