This excellent mask is a huge step up from the Moldex one I have been using. Better materials with silicone facepiece. Very comfy when worn for long periods. The exhaust valve is brilliant with virtually no build-up of exhaled moisture gathering inside the mask (a constant problem with the moldex). Also the inside of the mask is quite smooth with very few molded ribs to strengthen the mask body so very easy to wipe out and keep clean. The Face Mask Store was particularly helpful in answering my questions prior to purchase and afterwards when I had a minor difficulty with one of the P3 filters. Great prices and great service. Will definitely use them again.