A quick release head and neck strap system and a lightweight thermoplastic elastomer facepiece combine to allow the Trend® Air Stealth Dust Mask to quickly adjust to the contours of your face. This low profile design fits under face shields and offers less breathing resistance, less clogging pressure and inward leakage than other half mask respirators. The NIOSH N100 rated safety respirator filters feature a twin HEPAC pleat encapsulated design that filters 99.97% of airborne particles and aerosols at 0.3 micron and above.Features: Offers less breathing resistance, less clogging pressure and inward leakage then other half mask respirators Designed with a comfortable low profile that fits under face shields Protects users against non-oil-based airborne particles, mist and fumes Exhalation valve on bottom of the face piece that prevents exhalation fumes from steaming or fogging to glasses or visors Protective grill covers 100% of filter surface which protects the filter from moisture and particulates, allowing it to perform better in clogging pressure and filtration efficiency Includes 1 x Pair N100 filters to protect the user against non-oil based airborne particles, mist and fumes Specifications: Size: Small/Medium Filtration: Up to 99.99% of particles down to 0.3 microns Inward Leakage: 0.14% Manufactured From: High-grade hypoallergenic (latex-free, silicone-free and odor-free) materials Compliance: Approval N100 APF 10 x WEL What's Included: (1) Trend - Air Stealth Half Mask Dust Mask / Respirator - Small/Medium (2) N 100 Filters Notes: Medium/large size will fit most men, even those with a beard. Small/medium size will fit some men, most women and children.