A reusable N95 respirator is a durable breathing device designed for a tight facial fit, filtering at least 95% of airborne particles (like viruses, bacteria, and dust) using multi-layered, electrostatic meltblown filters, often made from polypropylene. Key features include adjustable straps, a nose clip for sealing, and options for exhalation valves to ease breathing, with some types being washable/reusable (like elastomeric models with replaceable N95 filters) or designed for limited reuse of the disposable FFP (Filtering Facepiece) type, requiring careful cleaning and storage to maintain filtration integrity and prevent contamination.