Procedure Mask. Light, comfortable masks for extended wear when necessary. Ear loops are made from special stretch yarn: no irritating rubber or plastic touches the skin. Three-ply, glass-free filter media is surrounded by soft, non-irritating inner and outer facing. Manufactured to EN 14683 IR regulation. Bacteria filtration of 99.9 % / 0,29 mikrons. Box of 50 masks each. Different colours available.