Mask,toraway Activated Carbon Anti Dust Cycling Half Face Mask Material:Hypo-allergenic neoprene givinga hands washing Military design mask provides excellent filtration against most type of pollution, an urban cyclist is likely to encounter included pollens, dusts, vehicle fumes and bacteria The filter is replaceable, and is designed to be effective at least 3 months in normal daily use Aluminum lock on the nose help easily fit the mask onto different nose shapes Includes two one way valves to allow easier exhalation of heat, water vapour and Carbon Dioxide, suitable for glass wearers With activated charcoal filter, filters out exhaust emissions