The S3+ face mask offers ASTM level 3 protection for remarkable fluid resistance. This Quad-Fold design allows for smoother breathability and lighter feel without compromising filtration. The revolutionary CoolSilk® lint-free inner layer provides a cool and long-lasting soft feeling without fluffy irritation. S3+ includes dye-free, chemical-free, and lint-free inner layers. Provides >99% bacteria (BFE) and particle filtration efficiency (PFE) at 0.1 micron. ASTM Level 3 protection.