5 Layer Filtration (Non-Woven Fabric has better bacteria filtration and air permeability while remaining less slippery than woven cloth, Melt Blown Face Mask Filter Material is a type of HEPA (high efficiency particulate air) filter. This 100% virgin polypropylene filtration material,Hot Air Sponge Filter effective at fine particulate filtration. UPTO 95% Filtration Efficiency. Flexible ear hanging loop for perfect fit. Cup type shape allows comfortable and close-fitting of the mask. Adjustable nose bridge, can be pressed to fit as per the size of the nose. Unisex Mask, One Size Fits All.