The Advantage 200 LS Respirator provides a better looking, lighter, and softer face piece, which is made from a translucent "Ocean Blue" formulation of thermoplastic rubber: The MSA patented MultiFlex® System – a soft, pliable combination of rubber and plastic that provides a virtually customized fit. In addition, the highly effective AnthroCurve™ Sealing Surface instantly conforms to each wearer, equalizing pressure on the face seal area and eliminating annoying pressure points. The unmatched fit exceeds all previous levels of comfort. This half mask type respirator features a twin filter cartridge with large area and capacity to provide for low breathing resistance and long life. Not for use in atmospheres containing less than 19.5% oxygen.