Moldex N99 Premium Particulate Respirator, Half Facepiece, 2-Strap, Medium/Large (507-2310N99) Box of 10Premium particulate respirator offers N99 protection for applications such as welding, metal pouring, torch cutting and brazing. Softspun liner adds durability and comfort. Dura Mesh shell holds up in extreme heat and humidity. Contoured faceseal and molded nose bridge deliver enhanced comfort, particularly during extended periods of wear. Respirator Type: Half Face Mask; Rating: N99; Valved: Yes; Size: One Size Fits All.