Reusable 3M™ 6000 series reusable mask features 3M™ Cool Flow™ valve helps reduce heat and moisture build-up while reducing breathing resistance, polycarbonate lens ensures optimal visibility, soft facial adjustment piece for increased comfort, 4-strap suspension allows for quicker mask removal and donning. Used for protection against gases, vapours and particles. Sold individually or per box with 4 units inside. Each unit measures 240 x 205 x 140 mm and each box with 4 units measures 320 x 280 x 440.