Unique Adjuster Beads- Gives Snug Fit Yet Relieves Strap Pressure. Outer Flame Retardant Layer- Protection From Welding Sparks. Activated Carbon Layer For Absorption of Nuisance Level of Odour and Vapour. Protect against Paint Mist & Nuisance Odour. Sewn Adjustable Double Elastic. Polyurethane Nose Liner For Comfortable Fit. Elastic Sewed Outside Filter Area- No Leakage. No Puncture on Filter. Aluminium Clip For Snug Fit, Cut Seal Edge- No Carbon Spillage. Long Life, Skin Friendly, Does not Deform in High Temperature. One Way Exhalation Vent Valve- Provide Breathing, Comfort Promotes Easy Communication, Butterfly Vent Valve.