Ear Loop and Tie-On Masks are made of soft, non-woven polypropylene. The 3-ply pleated design offers 0.5 micron filtration at greater than 95%. A full length flat aluminum wire forms comfortably to the nose and face to maintain an excellent fit for maximum filtration. Masks are fluid resistant and disposable. The Ear Loop Mask fits snugly around the ears with elastic loops. Tie-On Masks are secured with two pair of polypropylene ties.