As per IS:14166:1994Face-piece in NeopreneProduced from non-allergic, Soft & odourless material to ensure high comfortExhalation Valve to allow efficient escape of exhaled air containing CO2Speech diaphragm for clear communicationPull type strong, adjustable elastic gives snug fit yet relives strap pressureHead support gives even weight distribution & leak-proof fittingBroad Elastic with front pull adjustable bucklesHygienic Individually packed