With ours, N95 masks can be purchased without a valve to make breathing easier. Optimum protection is accomplished by snugly fitting the respirator mask over the neck, shielding the nose and mouth without leaving empty spaces around the bottom. Respirator masks should be properly fitted to the wearer and should not be obstructed by facial hair or jewellery. A poorly fitting respirator mask has a greater propensity for allowing air particles to pass through holes around the edges of the mask, offering lower rates of protection from inhalation or particle distribution than a properly fitted one. Click here 3M N95 Face Mask for sale