STEON Half face respirator maskBLS STEON is a half face respirator mask with one replaceable filter, one center filter thread and 2 additional exhalation flaps. Suitable filters for a STEON half face mask should not exceed 300g.Silicone sealMulti-level fasteningThe straps are not connected to the seal - this prevents its violation and inconvenience to the userThe mask seal is made of high-quality silicone - this gives a better seal, comfort and strength of the mask