Full face mask with B-Lock bayonet connection and face seal made of thermoplastic (BLS 5600) or silicone rubber (BLS 5700, BLS 5700/C). The anti-fog system is designed to avoid visor fogging through the control of the cold and hot air flows inside the mask. An aluminium layer, inside the breathing unit of the device (silicone models), enables a better transmission of the vocal sound. The visor allows a panoramic visual field without optical distortions and a vitrification treatment on its surface makes it scratch resistant. Fixed on 6 connection points, the harness guarantees a highly precise adjustment by distributing the pressure on the face uniformly. Silicon models are available in 3 different sizes (S/M/L) to perfectly fit all faces profiles. A corrective lens frame is available as an accessory. It is compatible with BLS 200 series filters.