The dimensional form creates a space around the mouth to ease breathing. Soft rubber straps are used to relieve irritation and pain to the ears. The Antimicrobial and anti-dust function will barely lose its effectiveness by washing. Only wash gently by hand wash. Do not iron. Antimicrobial. Deodorant finish. Cuts off 99.9% pollen. Non woven mask fights Asian dust. BFE (Bacterial & Viral Filtration Efficiency) 93.6%.