The Air Queen 3D Ergonomic Design Mask is constructed using 3 separate layers of protection including a middle layer of nano fiber filtration capable of blocking particles as small as .1 micron which covers the entire surface of the mask face. Its efficiency rating is similar to that of an N95 respirator but the mask itself is far more comfortable. This mask may be used up to ten times and can be cleaned after use with 70% alcohol. Air Queen Masks are slightly smaller than the Soomlab Nano Fiber Masks for adults with average or slightly smaller faces. Air Queen Masks are designed to be more moldable for a more customized fit. We recommend rather than placing the elastic straps around the ears that they be connected at the back of the head using a mask clip (included free in each order) but this may not be necessary when using the Air Queen. Proper fitting of a face mask to eliminate air gaps is as important for a mask's effectiveness the efficiency of the filtration material. This mask offers comfort, adaptability, and highly efficient filtration to most men and women with average to slightly smaller faces.