Anti-fog surgical masks with tie back fastening. Medical level 3 procedure mask - comfortable and breathable. BFE > 99% and BFR of 160mmHg. 4 layers: 2 x non-woven fabric + 99% melt blown fabric + microfibre non-woven. EN 14683 Type IIR, ASTM Level 3, AS/NZ 4381 Level 3, QMS EN 13485