All Vognxts feature middle layer of VNX filter recipe for helping to protect from microscopic particles. Currently, face covering mandates require masks that will efficiently filter INFLOW AND OUTFLOW of microscopic particles. For this reason, non-valved masks are required when in proximity of other people, in order to protect the mask wearer AND others in the environment. NON-VALVED VOGNXT help protect both the mask wearer from inhaling microscopic particles AND help protect the environment from the exhaled droplets of the mask wearer. Non-valved Vognxt feature the same highly efficient particle filtering media sewn into the middle layer of the mask as the valved Vognxts. Note that non-valved Vognxt filter both inflow and outflow. Reusable masks also contribute to the protection of the planet of the future. VALVED VOGNXT help protect the mask wearer only from inhalation of microscopic particles and feature two filter media sewn into the middle layers of the mask and 1 or 2 exhalation valves. Please note that the exhale of the mask wearer exits partially through the exhale valve unfiltered. Valved masks are suitable for biking, hiking, hazardous air quality, mold, dust, and environments for protection of the mask wearer who is not interacting with the public in close proximity. Vognxt offers highest quality materials and construction, manufactured under Quality Plan for conforming and efficient products.