The Moldex 2310 N99 particulate respirator features a filter to reduce nuisance odors and a Dura-Mesh® outer shell that retains its shape in moist condtions. Soft foam nose cushion provides secure fit without metal straps. Double straps holds dust mask firmly in place. N99 for a higher level of protection. NIOSH certified to have a filter efficiency of 99% or greater against particulate aerosols free of oil. Suitable for most welding applications. Meets heat and flame resistance in accordance with ANSI/ISEA 110-2003 Section 188.8.131.52 masks per box.