-Patented headstrap buckle to adjust length of headstrap for various facial sizes. -Cool latex-free textile braided headstrap for comfortable wearing. -Continuous loop headstrap design can allow to hang the mask around the neck when not in use. -No metal used. Avoid the contact between skin and metal and suitable forthose environments where metal is not allowed. -Polypropylene (P.P.) inner layer provides the most intimate touch to your face. -Pre-shaped nose cushion and soft closed-cell nose foam ensure custom shape and increase the worker comfort and acceptance. -Contour design ensures the compatibility of glasses/goggles and reduces fogging. -Embossed fringe seal avoids fluffy open layer around the edges. -Conforms to NIOSH 42 CFR Part 84 Standards as N95 Class.