Elastic Sewed Outside Filter Area-No Leakage. No Puncture on Filter. Nose Clip: Aluminium Clip For Snug Fit. Unique adjuster beads gives snug fit yet relieves strap pressure. Staples outside filter area to prevent leakage. Textile elastic head bands with adjuster and an exhalation valve. Contribute to the wearer comfort in tough working conditions. Assure comfort and valve to the wearer.