Venus - V4200 - N95 NIOSH Certified CDC Approved, NIOSH Certified - N95 Mask with Valve. auto filtering folded mask for particles, with a valve to facilitate exhalation, reduce fatigue, offer cool comfort inside the mask and make communication easier. Designed with 2 elastic head bands made of latex sewn to the outer part of the mask, nose clip and inner polyurethane padding, for better comfort and easy adjustment.