COMASEC worked out filtering half-masks against dust, having a nasal barette for a perfect adaptation to all the faces. The nasal joint in froth offers a perfect waterproofness. The range of the PURAIR S1, S2, S3 is constituted of filtering half-masks with valves of expiration which reduce the evacuation of humidity. Furthermore, these models are flexible which allows to put them easily in a pocket. All these masks are constituted with hypoallergenic materials filtering in weak respiratory resistance. So they offer an excellent respiratory comfort and are easy of use. This range of filtering half-masks answers the new standard IN 149: 2001 We made it for you, then use it!