Works as described. It has the wire on the top to press around the nose. Filters well. As described. Adjustable loop. Not good for prolonged active use because it can make breathing uncomfortable. Helps if you can't afford to buy disposables. At the end of the day, I handwash mine with soap and hot water. Then put it on the heated Towel Rail and it dries by the next day. When the elastic earloop gets uncomfortable, I then use a paperclip to join behind my head.